Question

A ball traveling with some velocity v hits another ball elastically which is stationary. What will happen to the system?

(a) The stationary ball will start moving with a velocity v and the moving ball will come at rest

(b) The stationary ball remains at rest and the moving ball starts moving in opposite direction

(c) Both the balls become stationary

(d) Both the balls start moving

I got this question in an online quiz.

Query is from Collision in division Work, Energy and Power of Physics – Class 11

Answer 1

The correct choice is (a) The stationary ball will start moving with a velocity v and the moving ball will come at rest

The explanation is: In this case also we need to conserve the momentum and write the expression for e. After some calculation we will find that the stationary ball will start moving with a velocity v and the moving ball will come at rest.