You are standing on a sheet of ice that covers the football stadium parking lot

Question

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 ball of mass 0.400 kg that is traveling horizontally at 12.0 m/s Your mass is 75.0 kg .

a: If you catch the ball, with what speed do you and the ball move afterwards?

b: If the ball hits you and bounces off your chest, so afterwards it is moving horizontally at 7.00 m/s in the opposite direction, what is your speed after the collision?

Explanation / Answer

part a )

momentum remain conserve

m1v1 + m2v2 = ( m1 + m2) vf

v2 = 0

0.400 x 12 = ( 75 + 0.400 ) * vf

vf = 0.064 m/s

part b )

Pman = m1v1 - (0.4 *- 7 )

here ball is moving in opposite direction

75 * v = 4.8 + 2.8

v = 7.6/75

v = 0.101 m/s

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