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Can someone check my work please, thank you.

  1. Mar 26, 2012 #1
    Can someone check my work please, thank you. :)

    1. The problem statement, all variables and given/known data

    A hockey player of mass 85 kg travelling at 15 m/s [N] collides with another hockey player of mass 70 kg at 5.0 m/s [E]. If the two hockey players lock skates during the collision and are held together, find the resultant velocity of the pair. Assume there is no friction.

    2. Relevant equations

    Ʃinitialρ = Ʃfinalρ

    3. Solution, I feel like it is wrong because my answer is 0.2 off what it is in the text book, I have no idea what decimal place they took. :(

    (70) * (5) = (155) (v * cosθ)

    (85) * (15) = 155(v * sinθ)

    ---------------------------

    350 = (155) (v * cosθ)

    1275 = 155(v * sinθ)

    ------------------

    sqrt((350)^2 + (1275)^2) ≈ 1322.17

    1322.17 / 155 ≈ 8.5 m/s [N15°E]

    The answer in the text book is 8.3 m/s [N16°E]

    Someone check if I'm correct please. Thank you. :)<3
     
  2. jcsd
  3. Mar 26, 2012 #2

    PhanthomJay

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    Re: Can someone check my work please, thank you. :)

    I get your answer.
     
  4. Mar 26, 2012 #3
    Re: Can someone check my work please, thank you. :)

    Yay! :)

    Textbook's wrong again. xD
     
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