+91-735-322-1155
FlagBACK
Flag General Physics> a ball is dropped from a building and sim...
question mark

  1. a ball is dropped from a building and simultaneously another ball is projected upward with some velocity.describe the change in relative velocities of the ball as a function of time (IIT JEE)
  2. drops of water fall at regular intervals from the roof of a building of height 16m. the first drop strikes the ground at the same moment as the fifth drop leaves the roof . find the distance between the 2nd and 3rd drops. (AIEEE-2007)

rohan , 7 Years ago
Grade 11
anser 2 Answers
Samyak Sharma
If you know the basics then you can solve it 
 
Remember that there are 4 drops in air simultaneously  
So take ratio like
 
1x+3x+5x+7x= 16
I.e. X=1
 
Distance between 2nd and 3rd drop is 5-3 = 2m
Last Activity: 7 Years ago
The RockStar
1A.... Initial Velocity of freely falling ball = 0
 
Initial velocity of projected ball = u 
 Relative velocity = u+0 =u
Final velocity of freely falling ball
 
👉 V=u+at, V1=0+gt, V1 = gt
 
Final Velocity (V2) of projected ball
 
👉V=u+at, v=u-gt   
 Relative velocity = gt + u - gt (because they are in opposite direction relative velocities are added)  = u
 
Relative velocity is independent on Time....
 
Change in Relative velocity = u - u =0 😄
Last Activity: 4 Years ago
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Other Related Questions on general physics

question mark

 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
1 Answer Available

Last Activity: 3 Months ago

question mark
moment of inertia of a equilateral triangle about an axis passing through centre and perppendicular to the plane
general physics
1 Answer Available

Last Activity: 3 Years ago

question mark
. 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
general physics
1 Answer Available

Last Activity: 3 Years ago

question mark
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
2 Answers Available

Last Activity: 3 Years ago

question mark
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
1 Answer Available

Last Activity: 3 Years ago