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Question

A body of mass m is projected at an angle of 45o with horizontal. If air resistance is negligible total change in momentum when it strikes the ground is:

A
2mv
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B
2mv
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C
mv
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D
mv/2
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Solution

The correct option is B 2mv
Momentum is defined as P=mv
Pi=mvsinθ
Pf=mvsinθ
Change in momentum =2mvsinθ=2mvsinπ4=2mv

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