A car of mass 1000kg moving at a speed of 80km per h-1 is brought to rest in 20s by a costant retarding force find the: (a) retardation and (b) retarding force exerted on the car.
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Explanation:
m=1000kg
u=80km/hr=80000/3600=800/36=200/9m/s
v=0
t=20s
retardation=v-u/t
=0-200/9/20
=200/9×1/20
=10/9
=1.11111111 m/s
f=ma
f=1000×1.111111
=1111.1111111N
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