posted by Jenny on .
Please help me on my science homework....Motor A uses 1000 joules of energy to move 200 newtons of force a distance of 3 meters. Motor B uses 1200 joules of energy to do the same job. What is the difference in percent efficiency between Motor A and Motor B?
Percent efficiency= workdone/energy used *100
You are given the energy used and the work done (Force*distance) for both machines.
i don't understand where is the workdone and the energy?