A car is running with a velocity of 72km/hr.if it is brought to rest suddenly by applying brakes by seeing a child 30 metre ahead on the road and bus stops at a distance of 20 metre,calculate the retardation of the car and the time taken by the car to come to rest.
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v*2-u*2=2as
0-400=40a
a=-10m/s*2
now,
t=v-u/a
t=0-20/-10
t=2sec
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