Question

A erson drivng a car with a speed 72km/h suddenly sees a boy crossing the road . If the distance moved by car before the person aplies brakes is 5m the reaction time of the erson is?

Answer 1

Answer:

reaction time is 25seconds

Explanation:

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.