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A motorboat traveling at a speed of 2.4 m/s shuts off its engines at t=0, Assume the drag force of the water is proportional to

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A motorboat traveling at a speed of 2.4 m/s shuts off its engines at t=0, Assume the drag force of the water is proportional to v(i.e., fD = -(am)v, mis the mass of the motorboat). The speed of the motorboat drop to half its original value after 3.0 s. How long does this motorboat travel before coming to rest after its engine shuts off? (in SI unit, In2 ~ 0.7, In3 ~ 1.1, In 5~ 1.6)

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