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Question

A ball of mass 3 kg collides with a wall with velocity 10m/sec at an angle of 30 with the wall and after collision reflects at the same angle with the same speed. The change in momentum of ball in MKS unit is-

A
20
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B
30
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C
15
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D
45
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Solution

The correct option is C 30
Δp=2mvcos60=mv=2×3×10×12=30kgm/s

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