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 B2musinα 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