Arefrigerator with a weight of 1,127 newtons needs to be moved into a house using a ramp. the length of the ramp is 2.1 meters, and its height is 0.85 meters. what is the percentage efficiency if a force of 496 newtons is applied to the refrigerator?

91.9 %

Explanation:

The percentage efficiency is equal to the ratio between the output work and the input work:

The output work is equal to the gravitational potential energy gained by the refrigerator, which is equal to its weight (W=1,127 N) times the gain in height (h=0.85 m):

The input work is equal to the product between the force applied on the refrigerator (F=496 N) and the displacement of the refrigerator (d=2.1 m):

So, the efficiency is

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