Question

1)By how much does the momentum of a body of mass 5kg change when its speed.a)Decreases from 20m/s to 0.20m/a.b)increasing from 30m/s to 40m/s.​

Answer 1

Answer:

Hey Mate !

(a).Here.

Mass of the body ,m=5 kg

initial velocity,u=20 m/s

final velocity,v=0.20 m/s

change in momentum=m(v-u)

                                    = 5(0.20-20) kg m/s

                                    = -99 kg m/s

The negative  sign shows  that the momentum  decrease (↓)

(b).Here,

mass,m=5 kg

initial velocity,u=30 m/s

final velocity,v=40 m/s

change in momentum=m(v-u)

                                   =5(40-30)

                                   =50 kg m/s

Here .the momentum of body decrease(↓) when the speed increase (↑)

Explanation:

Hope it helps u

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