Tyrone a teenager of 85-kg runs off the end of a horizontal, Ask an Expert

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Tyrone, a teenager of 85-kg, runs off the end of a horizontal pier and lands on the free-floating 158-kg raft which was initially at rest. After he lands on the raft, the raft, with him on it, moves away from the pier at 1.9 m/s. Determine the Tyrone's speed as he ran off the end of the pier?

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