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8 March, 07:40

a 20000kg railroad car is rolling 6.00m/s when 7000kg olaf id gravel is suddenly dropped in. What's the cars speed after gravel is loaded?

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  1. 8 March, 09:48
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    The cars speed after the gravel is loaded, V = 4.44 m/s

    Explanation:

    Given data,

    The mass of the railroad car, m = 20000 kg

    The velocity of the railroad car, v = 6 m/s

    The mass of the dropped gravel, m = 7000 kg

    The momentum of the railroad car,

    P = mv

    = 20000 x 6

    = 120000 kg m/s

    According to the law of conservation of momentum,

    P = V (M + m)

    V = P / (M + m)

    = 120000 / (20000 + 7000)

    = 4.44 m/s

    Hence, the cars speed after the gravel is loaded, V = 4.44 m/s
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