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13 June, 12:03

At 5000-kg freight car runs into 10000-kg freight car at rest. they couple upon collision and move with a speed of 2 m/s. what was the initial speed of the 5000-kg car?

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  1. 13 June, 12:09
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    Solution for the problem is:

    Total momentum before collision is always equal to total momentum after collision. So note that:

    Momentum of car A = 5000 x Xm/s

    Momentum of car A + B = 15,000 x 2m/s

    So combining the two, will give us the equation:

    15,000/5,000 = 3

    3 x 2 = 6m/s
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