What is the work done by the force of gravity?
How much work is done by the force of gravity when a 15 kilogram rock falls off of a bridge 20 meters high?
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Answer:
Work is equal to force times distance. Force in this case is the weight of the block: 15kg * 9.81 m/s^2 = 147.15 N The distance is 20 meters. 147.15 N times 20 metres is = 2943 J
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