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My brother connects two rocks with a very light rope equipped with a spring scale. He exerts an upwards force of 80N on rock 1.

My brother connects two rocks with a very light rope equipped with a spring scale. He exerts an upwards force of 80N on rock 1. Starting from rest, rock 2 moves downwards 12 m in 4.00s. The spring scale reads 36.0N during the descent. Find the masses of each rock.

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