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Q.

If a ball of mass m elastically collides against a wall with velocity v and return in the opposite direction with the same velocity, then the change in momentum is equal to

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a

2 m

b

2 v

c

2 mv

d

4 mv

answer is C.

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Detailed Solution

Δp=m1v1−m1u1=m(−u)−m(u)=−2mu|Δp|=2mv∵u=vΔp=p1−p2 (or) Δp=mv−(−mv)=2mv
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