In an elastic collision, a 300 kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 4.90 m/s and that of the trailing car is 6.20 m/s. Assuming that the mass of the drivers is much, much less than that of the bumper cars, what are their final speeds (in m/s)?

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  1. If the speeds change by v, then they must balance out.

    4.90+v = 6.20-v
    2v = 1.30
    v = 0.65

    So, the leading car ends up at 5.55 m/s
    the trailing car ends up at 5.55 m/s

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