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Question

Variation of force F acting on a body with time t is as shown in figure. Change in momentum of the body in the interval 4 s to 8 s is

A
10 kg ms1
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B
5 kg ms1
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C
100 kg ms1
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D
20 kg ms1
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Solution

The correct option is D 20 kg ms1
Change in momentum is area under curves.
due to similarity of triangles
208=F4F=10 N
Area of shaded region
12×4×F
=12×4×10

=20 N.s where Ns is derived SI unit of impulse or we call it as change in momentum, it is dimensionally equivalent to kg ms1

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