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A 0.2 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds at 20 m/s. Find the change in momentum of the ball as a result of the collision with the side walk (in kg m/s).
answer will be 2 kgm/s
change in momentum =mdv
=m(Vf - Vi)
=.2(30-(-20))=10N.S
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