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What impulse was delivered to the ball by the player?

  1. Nov 16, 2007 #1
    1. The problem statement, all variables and given/known data

    A 0.47 kg soccer ball approaches a player horizontally with a velocity of 18 m/s to the north. The player strikes the ball and causes it to move in the opposite direction with a velocity of 24 m/s.

    What impulse was delivered to the ball by the player? Answer in kg*m/s


    2. Relevant equations

    impulse = change in momentum
    momentum = mv


    3. The attempt at a solution

    0.47((24-(-18)) = 19.74 kg*m/s

    or would it be

    0.47(24-18) = 2.82 kg*m/s

    i'm lost
     
  2. jcsd
  3. Nov 16, 2007 #2
    The change in momentum will be

    [tex]mv_1-mv_2 = m(v_1-v_2)[/tex]

    Now keep in mind these are vectors. So one will be a negative number...

    [tex].47 kg (18 - (-24) \frac{m}{s})[/tex]
     
  4. Nov 16, 2007 #3


    oops i meant - 2.82, it says it wrong
     
  5. Nov 16, 2007 #4
    Nevermind I got it

    0.47(-24-18) = -19.74 thats the answer
     
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