Question

25. A person driving a car with a speed 72 km/h, suddenly sees a boy crossing the road. If the distance moved
by car, before the person applies brakes is 5 m, the reaction time of the person is
(1) 0.5 s
(2) 0.10 s
(3) 10 s
(4) 0.25 s



sln:
speed​

Answer 1

Answer:

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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.