A body of mass M collides against a wall with velocity V and rebounds with the same speed. Its magnitude of change in momentum is:
MV
0
2MV
MV2
A
MV
B
2MV
C
MV2
D
0
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Solution
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Given that the body of mass M, velocity V rebounds with the same speed. Change of momentum =M× (Change in velocity) =M(V−(−V))=2MV Thus, the change in momentum of the rebounding ball is 2MV.
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