a ramp is 3 m above the ground and is 4.5 m long. john uses force of 500 n to lift the box from the ground straight up to the top of the ramp, while mike uses a force of 250 n t push the same box up the complete length of the ramp. what is the percent efficiency of the ramp?

Question

anonymous · Answer

the work done by  John= 500* 3=1500 J
the work done by Mike=250*sqrt(4.5^2+3^2)=250*5.53=1382.5 J
%=(1500-1382.5)/1500*100=7.8

anonymous · Answer

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