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Equations of Motion

A person driv...

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

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Q. A person driving a car with a speed 72 km/h, suddenly sees a boy crossing the road . If the distance moved by a car, before the person applies brakes is 5m, the reaction time of the person is:

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Q. A car is moving at a speed of

72 k m / h r

on a road having

2 %

upward gradient. The driver applies brakes when he sees an obstruction. If his reaction time is

1.5 seconds

, assuming that the coefficient of friction between the pavement and tyre as

0.15

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