I\'m having trouble with this if anyone can help I\'d really appreciate it. You

Question

I'm having trouble with this if anyone can help I'd really appreciate it.

You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. A friend throws you a 0.430 kg ball that is traveling horizontally at 11.5 m/s . Your mass is 73.0 kg .

Part A: The first question was: If you catch the ball, with what speed do you and the ball move afterwards? The answer I got was v = 6.73 cm/s. I got it right but I'm having trouble with part B.

Part B: If the ball hits you and bounces off your chest, so that afterwards it is moving horizontally at 8.05 m/s in the opposite direction, what is your speed after the collision?

Explanation / Answer

In both cases you just have to use one fundamental. Law of conservation of momentum.
Mass of ball*vel. of ball = (Mass of ball and mass of body) * Speed of combined body(since they are now together)

part B

0.43 * 11.5 = 0.43 *8.05 + 73*v

v = 0.02 m/s

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