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18 August, 05:56

Tyler stands at rest on a skateboard. He has a mass of 120 kg. His friend (m = 60 kg) jumps into his arms at a speed of 2 m/s. If Tyler catches his friend, how fast will they move on the skateboard?

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  1. 18 August, 09:47
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    Momentum question. This is an inelastic collision, so

    m1v1+m2v2=Vf (m1+m2)

    Vf = (m1v1+m2v2) / (m1+m2) = [ (120kg) (0m/s) + (60kg) (2m/s) ] / (120kg+60kg)

    Vf=120kg m/s / 180kg

    Vf=0.67m/s

    0.67m/s
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