Question

A ball of mass m strikes a rigid wall with speed u and rebounds with same speed the impulse imparted to the ball by the wall is

Answer 1

Answer:

-2mu

Explanation:

We know that impulse is equal to change in momentum.

Initial momentum=mu

Final momentum=-mu

Change in momentum=-mu-mu= -2mu

Thus impulse= -2mu

Answer 2

The impulse imparted to the ball by the wall is 2mu but in opposite direction.

Explanation:

If the mass of a ball is m. It moves with a speed of u and rebounds with same speed. We need to find the impulse imparted to the ball by the wall. We know that the change in momentum of an object is called impulse imparted.

Here,

Initial speed is u and final speed is (-u).

So, the impulse is given by :

$J=m(-u-u)\\\\J=-2mu$

So, the impulse imparted to the ball by the wall is 2mu but in opposite direction. Hence, this is the required solution.

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