General Physics
Vector basic question but tricky forore.details lease check the attached image
Vector basic question but tricky forore.details lease check the attached image
1 Answer
Samyak Jain
Let speed of particle at t = 1s be u and that of particle at t = 2s be v.
uniformly accelerated in the three parts.
Average velocity is the ratio of total displacement to the time for which dispalcement has occured.
And for uniformly accelerated motion, we know, v = u + at ...(1) and v2 = u2 + 2as ...(2)
We need to calculate s/t. From (2), s = (v2 – u2)/2a 
s/t = (v2 – u2)/2at
s/t = (v2 – u2)/2(v – u) = (v – u)(v + u)/2(v – u) = (u + v)/2,
i.e. the average velocity is the mean of initial and final velocities for uniformly accelerated motion.
(You can remember this as a result.)
So for the first part, average velocity = V1 = (0 + u) / 2 i.e. u = 2 V1.
Similarly, V2 = (u + v)/2 = (2 V1 + v) /2 v = 2V2 – 2V1
v = 2(V2 – V1).
For last one second, average velocity = (v + 0)/2 = v/2 = 2(V2 – V1) / 2
= V2 – V1 .
Other Related Questions on general physics
In viewing through a magnifying glass, one usually positions one's eyes very close to the lens. Does angular magnification change if the eye is moved back?
In viewing through a magnifying glass, one usually positions one's eyes very close to the lens. Does angular magnification change if the eye is moved back?
general physics
Last Activity: 9 Months ago
moment of inertia of a equilateral triangle about an axis passing through centre and perppendicular to the plane
moment of inertia of a equilateral triangle about an axis passing through centre and perppendicular to the plane
general physics
Last Activity: 3 Years ago
. Because of the rotation of the earth, a plumb bob may not hang exactly along the direction of
the earth’s gravitational pull (its weight) but deviates slightly from this direction. Calculate the
deviation (a) at 40 latitude, (b) at the poles, and (c) at the equator
. Because of the rotation of the earth, a plumb bob may not hang exactly along the direction of
the earth’s gravitational pull (its weight) but deviates slightly from this direction. Calculate the
deviation (a) at 40 latitude, (b) at the poles, and (c) at the equator
the earth’s gravitational pull (its weight) but deviates slightly from this direction. Calculate the
deviation (a) at 40 latitude, (b) at the poles, and (c) at the equator
general physics
Last Activity: 3 Years ago
The length of a massless rod is measured using vernier callipers having 10 vernier scale divisions and least count of 0.1 mm. Two masses 1.00 ± 0.01 kg and 4.00 ± 0.02 kg are attached to its ends. If reading of vernier scale is 5 divisions coinciding with 1.3 cm, what is the % error in locating centre of mass from lighter mass
The length of a massless rod is measured using vernier callipers having 10 vernier scale divisions and least count of 0.1 mm. Two masses 1.00 ± 0.01 kg and 4.00 ± 0.02 kg are attached to its ends. If reading of vernier scale is 5 divisions coinciding with 1.3 cm, what is the % error in locating centre of mass from lighter mass
general physics
Last Activity: 3 Years ago
A block is kept on x-y plane at a point (2m,3m). It is pushed with a force of magnitude 10 Ntowards point (5m,7m). The force can be represented as?
A block is kept on x-y plane at a point (2m,3m). It is pushed with a force of magnitude 10 Ntowards point (5m,7m). The force can be represented as?
general physics
Last Activity: 3 Years ago