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Relative Position

A person driv...

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A person driving a car with a speed72km/hr,suddenly sees a boy crossing the road.if the distance moved by car,before the person applies brake is 5m the reaction time of the person is

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

Q. A person driving a car at a speed 72 km per hour, sees a boy crossing the road. If the distance moved by the car before the person applies brakes is 5 m, find the reaction time of the person.

Q. A person crossing the a road with a certain velocity due north sees a car moving towards east. The velocity of the car with respect to the person is

\sqrt{2}

times that of velocity of the person. The angle made by the relative velocity with the east is

Q. A car is moving with speed

20 m / s

. Suddenly the driver sees the sign of danger at a distance of

50 m

; after a certain reaction time

t_{0}

he applies brakes to cause deceleration

5 m / s^{2}

. What is the maximum allowable reaction time

t_{0}

to avoid accident and distance travelled by the during reaction time?

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