Posted by **PhysicsCrazy<3** on Friday, March 2, 2012 at 5:54pm.

A boy exerts a force of 210 N on a lever to raise a 1.25 103 N rock a distance of 12 cm. If the efficiency of the lever is 88.7%, how far did the boy move his end of the lever?

Thanks for all your help :)

<3,

PhysicsCrazy<3

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