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Question

A ball of mass 'm' is projected from the ground with a speed 'u' at an angle ' α' with the horizontal. The magnitude of the change in momentum of the ball over a time interval from begining till it strikes the ground again is

A
musinα2
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B
2mucosα
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C
mucosα2
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D
2musinα
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Solution

The correct option is B 2musinα
Over the course of the journey, the velocity of the ball in the x-direction is constant. So the momentum in that direction remains the same.
Initial momentum in y-direction pyi=musinα
Final momentum in y-direction pyf=musinα
change in momentum =2musinα
Magnitude of change =2musinα

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