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23 January, 20:33

The kinetic energy of a car is 8 * 106 J as it travels along a horizontal road. How much power is required to stop the car in 10 s?

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  1. 23 January, 21:00
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    The power required to stop the car = 8 * 10⁵ watt.

    Explanation:

    Kinetic Energy: This is the energy of a body in motion. The S. I unit of energy is Joules (J).

    Power: These is defined as time rate of doing work, or it can be defined as the time rate of transfer of energy. The S. I unit of power is Watt (W).

    Mathematically, power can be expressed as

    Power = Energy/time

    P = E/t ... Equation 1

    Given: E = 8*10⁶ J, t = 10 s

    Substituting these values into equation 1,

    p = 8*10⁶/10

    p = 8 * 10⁵ watt.

    Therefore the power required to stop the car = 8 * 10⁵ watt.
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