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:
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
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