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26 July, 14:41

A magnetic hockey puck (0.40 kg) hits another hockey puck (0.40 kg) at rest and both travel together to the right at 8.0 m/s. How fast was the first hockey puck initially moving?

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  1. 26 July, 15:38
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    Momentum is conserved and P=mv

    Therefore

    (0.4+0.4) x8 = 6.4

    6.4/0.4=16ms^-1
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