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Answer on Mechanics | Relativity Question for frank godwin

Question #57550
A thin rod length 2l and mass M is located above the flat surface slippery. a small ball mass m and velocity v0 pounding the rod tip .Assume that the colission is elastic and the speed of the ball after a collision parallel with the initial speed .

A) Calculate the ratio of M / m so that the ball is at rest after the collision
B) Calculate the minimum time that required of the rod to perform one round
C) Calculate the speed of the ball if there is a shaft at the lower end of the rod

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