Question

14. A car is moving with a uniform velocity 30 m 5-1. It is stopped in 2 s by applying a force
of 1500 N through its brakes. Calculate : (a) the change in momentum of car, (b) the
retardation produced in car, and (c) the mass of car.
$....$
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Answer 1

Answer:

v=0

u=30m/s

f=1500N

Acceleration= (v-u)/t   (0-30)/2-30/2=15 m/S2

Retardation= 15m/S2

Force= F=ma

1500=m(-15)

m=1500/15

m=100kg

Change in momentum= mv-mu

                                     (-100*0)-(-100*30)0+3000 =3000kg m/s