Question

A ball of mass 'm' strikes against a rigid wall with speed 'u'; and
rebounds with the same speed. The impulse imparted to the ball by the
wall is :
(A) 2 mu
(B) -mu
(C) Zero
(D) -2 mu​

Answer 1

Answer:

-mu

third law of motion

Answer 2

Answer:D

Explanation:

Given

mass of ball =m

Speed of ball =u

and it rebounds with same speed u in opposite direction

And we know Impulse =change in the momentum

Impulse$=m\left ( -u-u\right )$

=-2mu