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1) A tennis ball and a basketball are dropped simultaneously, with the tennis ball aligned directly above the basketball and separated from it by a small distance. The mass of the tennis ball is m=0.057kg and the mass of the basketball is M=0.57kg. Assuming completely elastic collisions, what is the velocity of the tennis ball immediately after it strikes the basketball, If the basketball strikes the floor at 4.0m/s?

2) Describe an experimental method for determining the center of mass of any object, including irregularly shaped objects.

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