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28 March, 17:10

The engine of a motorcycle did an amount of work W while reaching a speed

of v. If the engine could perform work 4W then the final speed would be?

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  1. 28 March, 20:17
    0
    2v

    Explanation:

    Work = change in energy

    W = KE

    W = ½ mv²

    At 4 times the work:

    4W = ½ mu²

    4 (½ mv²) = ½ mu²

    2 mv² = ½ mu²

    2 v² = ½ u²

    4 v² = u²

    u = 2v
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