A smooth sphere is moving on a horizontal surface with velocity vector `2hati+2hatj` immediately before it hits a vertical wall. The wall is parallel to `hatj` and the coefficient of restitution of the sphere and the wall is `e=1/2`. Find the velocity of the sphere after it hits the wall?

Answer

A, B

Explanation

Component parallel to wall will remain unchanged and component perpendicular to wall will become e times but in opposite direction.