A car is running with a velocity of 72 km/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
i) retardation of the car
ii) time taken by the car to come to rest.
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Answer:
Correct option is
D
0.25 s
v=72km/hr=
18
72×5
=20m/s
Time taken to cover the distance of 5m is:
t=
20
5
=0.25sec
This time is called Reaction time.