Question

A ball of mass m strikes a rigid wall with speed u and rebounds with the same speed. The
impulse imparted to the ball by the wall is :
(1) mu 2
(2)mu
(3) zero
(4) -2mu​

Answer 1

Answer: -2mu​

Explanation: -2mu

p  initial  =mu, p  final =−mu

Impulse imparted to the ball = change in momentum

= p initial =mu, p  final  =−mu−mu= -2mu

Answer 2

answer

Impulse imparted to the ball = Change in momentum

4)-2mu