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 ???
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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.
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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