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31 March, 15:27

56 J of work was done to increase the kinetic energy of a 1.90 kg mass. If the object's initial velocity was zero, what is its speed now?

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  1. 31 March, 18:05
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    7.68 m/s

    Explanation:

    Ek = 56 J

    m = 1.90 kg

    u = 0

    v = ?

    Ek = 0.5m (v - u) ²

    56 = 0.5*1.90 * (v - 0) ²

    56 = 0.5*1.90v²

    56 = 0.95v²

    v² = 56/0.95 = 58.95

    v = √58.95

    v = 7.68 m/s
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