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Math Help - Momentum collision problem

  1. #1
    Junior Member
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    Momentum collision problem

    Two 72.0 kg hockey players skating at 5.45 m/s collide and stick together. If the angle between their initial directions was 115 ^{o}, what is their speed after the collision?


    p_{ix} = p_{fx} = 0

    p_{iy} = p_{fy}

    m_{A}v_{A} + m_{B}v_{B} = (m_{AB})(v_{AB})

    (72)(5.45cos(32.5)) + (72)(5.45cos(32.5)) = 144v_{AB}

    v_{AB} = 4.60 m/s

    Am I correct?
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  2. #2
    Super Member Aryth's Avatar
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    You're using the wrong angle... You need to use cos(57.5) instead... The adjacent sides you're solving for get canceled out.
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