Posted by **Jenny** on Tuesday, November 7, 2006 at 4:10pm.

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?

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