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28 July, 06:57

A 150-kg roller-coaster car climbs to the top of a 91 - m - high hill. How much work is done against gravity as the car is lifted to the top of the hill?

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  1. 28 July, 08:24
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    10 m/s

    Explanation:

    The potential energy of the roller coaster is converted to kinetic energy. According to law of transformation of energy, potential energy = kinetic energy.

    mgh = ½mv². Take g as 10m/s².

    150 * 10 * 50 = ½ * 150 * v².

    7500 = 75v².

    v² = 7500/75.

    v = √100.

    v = 10 m/s
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