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21 March, 19:02

Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock? A) 0 B) 2 C) 4 D) 8

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  1. 21 March, 21:56
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    Answer: 4

    The lever enabled Jeff to lift 600 pounds with merely 150 pounds.

    By definition, the mechanical advantage is 600/150 = 4.
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