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A billiard ball with mass, .16kg , sitting at the edge of a table is struck...

A billiard ball with mass, .16kg , sitting at the edge of a table is struck in a head on elastic collision by a cue ball, mass .17kg . The billiard ball lands 0.21 m from the table’s edge and the table is 0.85 m tall. With what speed did the cue ball strike the billiard ball? (Hint: You do NOT have enough information to use conservation of momentum by itself.)

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