Question

calculate change in momentum of a body weighing 5 kg when its velocity decreases from 20 m per second to 0.20 metre per second

Answer 1

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Change in momentum = mv - mu

Here m = 5kg ,

u = 20m/s

and

v = .20m/s

= Change in momentum = 5(.20) - 5(20)

= 1 - 100

= - 99 kg m/s


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Answer 2

change in momentum(∆p)=m∆v
=5×(19.8)
=99kgm/s.