Math/Science
posted by Soraya .
Can someone please give an example of how i can use this formula in a word problem...
Percent efficiency=
Work out (J)
_____________ x100
Work in (J)

The electric motor that hauls our boats out of the water is 80% efficient.
the power out of the motor needed to haul the boat at .1 meter per second is 16 thousand Watts. How much power must go into the motor from the electric cable in the street?