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Child walking on boat. A child who is standing in a $97$ kg flat$-$bottom boat is initially $6\mathrm{.}0$ m from shore. The child starts to walk along the boat toward the shore. After walking $2\mathrm{.}4$ m relative to the boat, the child is $4\mathrm{.}1$ m from the shore. Assuming there is no drag from the water, find the child's mass.

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