Physics

Your teenage kid finally gets his drivers license. He takes off in your brand new car that weighs 2000kg at 47m/s when he hits a parked semi that weighs 40000kg. They plow forward in a perfectly in elastic fashion in the same direction. What is the velocity of the wreck?

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  1. conserve momentum, so

    (2000)(47) = (2000+40000)v
    v = 1/21

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