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A man stands in the middle of a boat, which is 4.1 m long and has a mass of 75 kg. The end of the boat that is closest to land is 2.7 m from the shore. The man now walks toward the shore until he comes to the end of the boat. Suppose the man is 3.4 m from shore when he reaches the end of the boat. What is the mass of the man?

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