A person driving a car with a speed 72

Asked by admin @ 13/08/2021 in Physics viewed by 374 People

A person driving a car with 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,( note that v is not equal to 0 m/s) the reaction time of person is ???

Answered by admin @ 13/08/2021

The reaction time will be given by the speed and the distance covered.

72 km/hr = 72000m/ 60 x 60 s = 20m/s

speed = 20m/s
if 20m is covered in 1s
then 5m will be covered in 1 x5/20 = 0.25s

Therefore his reaction time is 0.25 seconds.

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