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Question

A particle of mass 1 kg is projected with a velocity of 20 m/s at an angle of 30 with the horizontal. Find the change in the momentum (kgm/s) of the particle between the points of projection and the highest point. Take g=10 m/s2

A
20
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B
10
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C
30
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D
40
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Solution

The correct option is B 10
Since the velocity is constant in the horizontal direction, momentum will change only in vertical direction. At the highest point, velocity in the vertical direction is zero.
Hence, Δ p=mu sin θ=1×20×12=10 kgm/s

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