Batman (mass = 98.7 kg) jumps straight down from a bridge into a boat (mass = 422 kg) in which a criminal is fleeing. The velocity of the boat is initially +10.7 m/s. What is the velocity of the boat after Batman lands in it?

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Batman (mass = 98.7 kg) jumps straight down from a bridge into a boat (mass = 422 kg) in which a criminal is fleeing. The velocity of the boat is initially +10.7 m/s. What is the velocity of the boat after Batman lands in it?

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