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A billiard ball, A, with unknown mass, travels horizontally at ?? = 2.50 m/s when it...

A billiard ball, A, with unknown mass, travels horizontally at ?? = 2.50 m/s when it strikes another billiard ball, B, with the same mass, sitting at the edge of a table which is ℎ = 0.800 m high. Assume that the collision of the two billiard balls is perfectly elastic. Calculate the horizontal distance billiard ball B travels from the edge of the table until it hits the ground.

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