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**Energy Calculation ~~help**

## Homework Statement

Question )

An 800W electric motor is used to raise a load. In 120s, the load gains

24,000 J of gravitational potential energy from the motor

Calculate :

a) electrical energy supplied to the motor

b) energy wasted by the motor

c) output power of the motor

d) efficiency of the motor

## Homework Equations

W=J/s

## The Attempt at a Solution

I have no idea //

i've got a big school exam next Monday T-T

help me~

thank you