Calculate re coil velocity using conservation of momentum.

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1. Nov 2, 2015

marcosdannyjp

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
2.09 m/s

2. Nov 3, 2015

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.