A ball of mass m moving with velocity v collides elastically with wall and rebounds. The change in momentum of the ball will be :
A
4mv
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B
2mv
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C
mv
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D
zero
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Solution
The correct option is C2mv Here, a ball of mass m moving with velocity v collides elastically with wall hence, momentum is pi=mv The ball rebounds from wall hence, final momentum is pf=−mv Change in momentum is Δp=pi−pf Δp=mv−(−mv)=2mv