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Question

A body of mass 0.05 kg travelling with a velocity of 5 m/s makes an angle of 30 with the wall as shown. The body rebounds with the same speed making an angle of 30 with the wall. Find the change in momentum of the body in Ns.

A
0.25
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B
0.5
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C
0.75
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D
1
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Solution

The correct option is A 0.25
Considering left to be positive direction,
u=5 sin30
v=5 sin30
p=m(vu)
=5×102(52+52)
=0.25 Ns

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