a block and tackle pulley system of 6 pulley uses 300N to overcome 1200N.find efficiency

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1. Answer:

   66.7%

   Explanation:

   There are 6 pulleys, so the mechanical advantage is 6.

   The theoretical force needed to overcome 1200 N is therefore:

   1200 N / 6 = 200 N

   The actual force is 300 N.  So the efficiency is:

   200 N / 300 N × 100% = 66.7%

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