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A boy and a dog are standing on a 110-kg diving raft in the middle of...

A boy and a dog are standing on a 110-kg diving raft in the middle of a lake. Just as the 55-kg boy dives off the raft with a horizontal velocity of 4.0m/s due east, the 22-kg dog of 5.0m/s due north. What is the resulting velocity of the raft?
science   Advanced-Physics   
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