A roofer needs to get a stack of shingles onto a roof. Pulling the shingles up manually uses 1,549 n of force. The roofer decides that it would be easier to use a system of pulleys to raise the shingles. Using the pulleys, 446 n are required to lift the shingles. What is the mechanical advantage of the system of pulleys? Explain your answer
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= Output force = 
= Input force = 
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A roofer needs to get a stack of shingles onto a roof. Pulling the shingles up manually uses 1,549 n...
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