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9 December, 17:48

A moving car has kinetic energy. To bring the car to rest, you must decrease its kinetic energy to zero. The brakes do this work by applying a force over a distance. What effect would doubling the speed have on the braking distance?

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  1. 9 December, 18:09
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    The braking distance would be 4 times greater

    Explanation:

    A moving car has kinetic energy. To bring the car to rest, you must decrease its kinetic energy to zero. The brakes do this work by applying a force over a distance. What effect would doubling the speed have on the braking distance?

    kinetic energy is the energy possessed by a body due to motion. the unit is in joules

    m=mass of the car,

    mass is he quantity of matter in a body

    v=velocity possess by the car, velocity is change in displacement per time

    ke=1/2mv^2

    when V is doubled

    we have

    Ke2=1/2m (2V) ^2

    Ke2=1/2m4v^2

    Ke2=4 (1/2mv^2)

    Ke2=4ke

    The braking distance would be 4 times greater
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