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Drivers are trained that if the velocity...

Drivers are trained that if the velocity of a car is doubled then the distance required to bring the car to a halt should be four times. Explain.

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When the speed of car is doubled, the distance required to stop it becomes 4 times. Why?

The time required by a motor car to travel a cartain distance is 3 hours less if its velocity be increased by 9 kilometres per hour. Again ,if the velocity be decreased by 6 kilometres per hour , then the time required by the car to travel the same distance is 3 hours more. Find the velocity of the car and the certain distance.

Knowledge Check

  • Velocity of a car decreases from 45 m/sec to 30 m/sec in 5 sec. Time taken to bring the car rest will be

    A
    20 sec
    B
    12 sec
    C
    10 sec
    D
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  • A train approaching a hill with a speed of 40 km/h sounds a whistle of frequency 580 Hz when it is at a distance of 1 km from a hill. Wind with a speed of 40 km/h is blowing in the direction of motion of the train. The velocity of sound in air 1200 km/hr. The distance from the hill at which the echo from the hill is heard by the driver and its frequency is

    A
    `30/29` km, 600 Hz
    B
    `29/31` km, 618.6 Hz
    C
    `30/29` km, 500 Hz
    D
    `29/30` km, 599.3 Hz

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