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Working with power, force and efficiency in a speed problem

A 7.5 x 10^4 W motor that is 75% efficient exerts an average force of 3.5 x 10^3 N to move a boat at a constant speed. How fast is the boat moving?
NOTE: efficiency = output/input.
Motors are rated as to their input. 7.5 x 10^4 is the power input.

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The output power of a motor has the relation with the force it ...

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