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Calculate re coil velocity using conservation of momentum.

  1. Nov 2, 2015 #1
    1. The problem statement, all variables and given/known data
    A 70.0-kg man and a 55.0-kg woman holding a 2.50-kg purse on ice skates stand facing each other.

    (a) If the woman pushes the man backwards so that his final speed is 1.50 m/s, with what average force did she push him,

    assum ing they were in contact for 0.500 s? (b) What is the woman's recoil speed? (c) If she now throws her 2.50-kg purse

    at him at a 20. 0° angle above the horizontal and at 4.20 m/s relative to the ground, what is her subsequent speed?

    I know part a and b, but I need help with part c.

    2. Relevant equations
    kinematics equations
    Newton's 2nd and 3rd law
    conservation of momentum formula
    impulse formula F*delta t= impulse = change in momentum

    3. The attempt at a solution
    the answer should be
    2.09 m/s
  2. jcsd
  3. Nov 3, 2015 #2


    User Avatar

    Staff: Mentor

    Hi marcosdannyjp.

    You need to show what you've tried so far, even if you didn't reach a satisfactory result. Helpers can't help you without first seeing your effort.
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