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A driver travelling at 90 kph applied th...

A driver travelling at 90 kph applied the brakes for 5 s. If the braking acceleration was `2 m//s^(2)`, what was her final speed ?

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A person travelling at 43.2 km/h applies the brake giving a deceleration of 6.0 m/ss^2 to his scooter. How far will it travel before stopping?

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Knowledge Check

  • A train is travelling at a speed of 90 km//h . Brakes are applied so as to produce a uniform acceleration of - 0.5 m//s^(2) . Find how far the train will go before it is brought to rest.

    A
    484 m
    B
    250 m
    C
    625 m
    D
    400 m

  • When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then retardation will be :

    A
    `+2m//s^(2)`
    B
    `-2m//s^(2)`
    C
    `-0.5m//s^(2)`
    D
    `+0.5m//s^(2)`

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    A car is moving with constant speed 15 m//s . Suddenly the driver sees an obstruction on the road and takes 0.40 s to apply the brake, the brake causes a deceleration of 5 m//s^(2) . Find the distance traveled by the car before it stops.

    A motorcyclist started up, rode for 20 s with an acceleration of 1.5 m//s^(2) , then 2 min at a constant speed, and finally, braked uniformly for 15 s and stopped. Find the maximum speed, the decleration during braking and the distance covered by the motorcyclist (graphically).

    A driver of a car A travelling at 54 km//h applies the brakes and stops the car in 4 seconds. Another driver of car B travelling at 36 km//h applies the brakes and stops the car in 6 seconds. Plot speed versus time graphs for the two car. which of the cars travelled farther before stopping ?

    The brakes of a train which is travelling at 30 m//s are applied as the train passes point A. The brakes produce a constant retardation of magnitude 3lambda m//s^(2) until the speed of the train is reduced to 10 m//s . The train travels at this speed for a distance and is then uniformly accelerated at lambda m//s^(2) until it again reaches a speed of 30 m//s as it passes point B. the time taken by the train in travelling from A to B, a distance of 4 km, is 4 min. Sketch the speed time graph for this motion and calculate:- (i) The value of lambda (ii) Distance travelled at 10 m//s .

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    On seeing red light ahead, a driver takes 0.3 s to apply the brakes. This is called the reaction time of the driver. If he was initially driving at a speed of 36km/hr and application of the brakes causes a deceleration of 4.0m//s^(2) . Calculate the distance travelled by the car after he sees the red light.

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