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May 29, 2015

Homework Help: Integrated Physics and Science

Posted by Nella on Monday, January 10, 2011 at 11:07am.

A crowbar is used as a lever. The effort force of 40 newtons moves 3 meters. The resistance force of 54 newtons moves 2 meters. What is the efficiency of the lever?

A) 100% because energy must be conserved
B) 90%
C) 25%
D) 18%

i need help. i don't know how to figure this one out

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