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7 September, 18:05

A 1500 kg car, initially traveling at 22.0 m/s, hits its brakes and skids to a stop. Determine the work done by friction.

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  1. 7 September, 21:32
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    The work done by the car is 363 kJ

    Explanation:

    Work : Work is said to be done when a Force moves an object through a certain distance. Work and Energy are interchangeable because they have the same unit. The unit of work is Joules (J).

    Mathematically work done can be expressed as,

    E = W = 1/2mv²

    W = 1/2mv² ... Equation 1

    Where E = Energy, W = work done, m = mass of the car, v = velocity of the car

    Given: m=1500 kg, v=22 m/s

    Substituting these values into equation 1

    W = 1/2 (1500) (22) ²

    W = 750 * 484

    W = 363000 J

    W = 363 kJ

    Thus the work done by the car is 363 kJ
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