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12 November, 05:20

A hockey puck is traveling to the left with a velocity of v=10 when it is struck by the hockey stick

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  1. 12 November, 05:51
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    We have to calculate the impulse of a hockey puck.

    Imp = m * (v 1 - v 2) = m * Δ v

    v 1 = - 10 i m/s,

    v 2 = (20 * cos 40°) i + (20 * sin 40°) j =

    = (20 * 0.766) i + (20 * 0.64278) j = (15.32 i + 12.855 j) m/s

    Δ v = (15.32 i + 12.855 j) - ( - 10 i) =

    = 15.32 i + 12.855 j + 10 i = 25.32 i + 12.855 j

    | Δv | = √ (25.32² + 12.855²) = √806.35 = 28.4 m/s

    Imp = 0.2 kg * 28.4 m/s = 5.68 N-s

    Answer: D) 5.68 N-s.
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