Question

A ball having a certain mass is moving with a velocity 'x' on a horizontal surface. The ball collides with a stationary ball having four times its mass. The first ball immediately comes to rest after collision. With velocity will the second ball move?

1) 0.25x
2) 0.5x
3) 4x
4) 1x

Answer 1

We have been given that u = 3 m s–1 and v = 7 m s–1, t = 2 s and m = 5 kg.
From Eq. (5) we haveAnswer here

Answer 2

(1) 0.25x is the velocity of the second ball.