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bino varghese
18 Points
8 years ago

1) a

Nimeesh TP
18 Points
8 years ago

1-a

Raashid Parvez
18 Points
8 years ago

1.(a)

rony varghese
14 Points
8 years ago

1. A particle is moving in a straight line with initial velocity u and retardation av, where v is the velocity at any time t [a] the particle will cover a total distance u/a [b] the particle will come to rest after 1/a [c] the particle will continue to move for a very long time [d] the velocity of the particle will become u/2 after time 1/a

22. A particle moves along the xaxis as x = u(t-1)+ a(t-3)3

[a] initial velocity of the particle is u [b] the acceleration of the particle is a [c] the acceleration of the particle is 2a [d] the particle is at the origin at time t=3 seconds

3. A particle is projected vertically upwards [a] the speed decreases uniformly with distance [b] the speed decreases uniformly with time [c] the KE decrease uniformly with time [d] KE decreases uniformly with distance

4. If an observer moves at constant speed along the line joining two stationary objects> he will the two objects [a] have the same velocity [b] have the same speed [c] move in opposite directions [d] move in the same direction.

5. A particle is moving with uniform acceleration along a straight line AB. Its speed at A and B are 2m/s and 14m/s respectively. Then [a] its speed at the midpoint is 10m/s [b] its speed at point P such that AP:PB is 1:5 is 4m/s [c] the time to go from A to mid point of AB is double to move from mid point to B
[d] none of the above.

[b] the average acceleration is 8m/s6. A body starting from rest is moving with uniform acceleration of 5m/s2 for time 10s, and after that with uniform acceleration of 10m/s2 for 15s, then [a] average acceleration of the body is 7.5m/s22

[c] total distance covered is 1875m [d] total distance covered is 2125m

7. A particle moves first 10m in 2s and 20m in the next 3s and 30m in next 10s. which of the following statements are true for motion? [a] the particle is moving with uniform velocity [b] the average speed of the particle is 4m/s [c] the particle is uniformly accelerated [d] the particle has deceleration during the motion

8. Suppose a and v denoted the acceleration and velocity vector if the body in one dimensional motion: [a] speed must increase if a > 0 [b] speed must increase if v and a >0 [c] speed must decrease if a<0 [d] speed will decrease if v<0 and a>0

Bt9. The motion of the particle falling in the restive medium is given by dv/dt = A-Bv where A and B are constants. Then [a] the initial acceleration of the body is A [b] the velocity at which the acceleration becomes zero is A/B [c] the velocity at any time t is A(1-e-)/B [d] all the above are wrong

210. The displacement of the particle depends upon time as x = at– ßt3

a[a] the particle will come to rest after time t=2/3ß [b] the particle will return to the starting point after time a/ß [c] no net force acts on the particle at t=a/3ß [d] the initial velocity of the particle was zero but initial acceleration was not zero.

11. A lead ball is dropped into a lake from a diving board 5m above the water. If it hits the water with certain velocity and sinks to the bottom with same constant velocity. It reaches the bottom 5s after it is dropped. [a] the depth of the lake is 40m [b] the depth of the lake is 50m [c] the average velocity of the ball is 5m/s [d] the average velocity of the ball is 9m/s

12. A balloon starts rising from the ground with an acceleration of 2.5m/s2. after 4 seconds the stone is relased from the balloon. If g=10m/s2. The stone will [a] have displacement of 25m [b] cover a total distance of 30m [c] reach the ground in 3.2s [d] begins to move down after it is released.

13. Which of the following about distance are true? [a] it can’t be negative [b] it can be zero [c] it can be lesser than the magnitude of the displacement [d] it can never decrease with time

14. A particle of mass m moves on the x axis as follows. It starts from rest t t=0 from the point x=0 and comes to rest at time t=1 at the point x=1. No other information is available about intermediate times. If a denotes acceleration, then [a] a cannot remain positive for all values of time between 0 and 1

[b] cannot exceed 2 at any pont in its path

[c] must be 4 at some point on its path [d] a must change sign during motion but no other assertion can be made

15. A ball is dropped from the window of a train moving with uniform velocity. The ball will reach the ground following a [a] parabolic path for the passenger [b] parabolic path for man standing on the ground
[c] straight line path for the passenger [d] none of these

16. A particle starts moving along a straight line with velocity of 10m/s. after 5 seconds the distance of the particle from the starting point is 50m. which of the following statement is true about the motion of the particle is true? [a] the motion may be with constant acceleration [b] the motion may be with the constant velocity [c] the motion may be continuously retarded [d] motion may be first accelerated and then retarded

17. A body is dropped from the top of the tower of height h. it covers a distance h/3 in last minute of its motion. If g=10m/s2, how much time does it take to reach the ground? [a] 2 + v3s [b]2-v3 s [c] 3+v6s [d] 3-v6 s

18. A Car starting from rets has a constant acceleration a1 for time interval t1 during which it covers a distance s1. In the next time interval t2 the car has retardation a2 and comes to rest after covering distance s2 in time t2. the average speed of the car during the journey is given by [a] a1t1/2 [b] a2t2/2 [c][a1+a2][t1+t2’4 [d]zero

19. a man throws a stone vertically upwards with a speed of 20m/s from the top of the high rise building. Two seconds later, an identical stone is thrown vertically downwards with speed of 20m/s. then: [a] the relative velocity between the two stones remains constant till one hits the ground [b] both will have the same kinetic energy when they hit the ground [c] the time interval between their hitting the ground is 2s [d] if the collision with the ground is perfectly elastic both will rise to the same height above the ground

220. An aeroplane flis along the straight line from A to B with speed V and back again with the same speed. If there is steady wind speed v. the distance between A and B is l [a] total time for the round trip, if wind blows along the line AB is 2V/[V-v22] [b] total time for round trip if the wind blows perpendicular to AB is 2V/[V-v2] [c] total time for round trip is always increased by the presence of the wind [d] total time for round trip depends on the direction of the trip

21. A particle starts from origin with coordinates at time t=0 and moves in th e xy plane with constant acceleration a in the y direction. Its equation of motion is y=ßx2. its velocity component in the x direction is equal to [a]variable [b] a/2ß

[c]

[d]

[d] 90[c] 60[b] 30022. A body is projected at an angle of 300 to the horizontal with a speed of 30m/s. what is angle with the horizontal after 1.5 seconds? [a] 0000

23. A projectile is thrown with the initial velocity of 50m/s. the maximum horizontal distance this projectile can travel is [a] 64m [b] 128m [c] 5m [d] 255m

24. The range of projectile which is launched at an angle of 150 with the horizontal is 1.5km. what is the range of projectile which is fired at an angle of 450 with same speed? [a] 1.5km [b] 3km [c] 6km [d] 0.75km

25. When air resistance is taken into account while dealing with the motion of the
projectile which of the following properties shows an increase? [a] range [b] maximum height [c] speed with which it strikes the ground [d] the angle at which the projectile hits the ground

26. A ball rolls off the edge of the stairway with a horizontal velocity of magnitude 1.8m/s. the steps are 0.2m high and 0.2m wide. Which step will ball hit first? [a] first [b] second [c] third [d] fourth

27. A hunter aims at the monkey sitting on a tree at considerable distance. At the instant he fires at it the monkey drops. Will the bullet hit the monkey? [a] no [b] yes [c] sometimes [d] never

[b] tan028. The angle of projection, which for which the horizontal range and maximum height are equal is [a] 45-1-1[4] [c] tan[0.25] [d] none of these

29. The height y and the distance along horizontal traveled by projectile is given by y = 8t-5t2 and x=6t. the velocity of projection is [a] 8m/s [b] 6m/s [c] 10m/s [d] can’t be found

30. A body is projected at an angle of 300 to the horizontal with kinetic energy E. the KE at the highest point is [a] zero [b] E/4 [c] E/2 [d] 3E/4

rajiv freak
18 Points
7 years ago

SRIKANTH
12 Points
6 years ago
acceleration pependicular to velocity