Question

A body of 20 kg is moving with velocity 3 m/s collides with wall and returns back. with same velocity.then impulse on the body will be

Answer 1

In an elastic Collision, if u2=0 and m2>>m1 then v1= -u1, v2= 0.
And we know that impulse= change in momentum.
Detailed solution is in the attachment.
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Answer 2

Impulse = change in momentum
= m * (v - u)
= 20 * (3 - (-3))
= 20 * 6
= 120 kg m/s

Impulse on the body will be 120 kg m/s