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Chemistry, 17.12.2020 16:30 cheating53

Diego is trying to lift a piano to the second floor of his house. Diego uses a pulley system and gives a big lift to the piano. The piano moves upward, then stops, and then it starts to fall to the ground. (The direction of the force of gravity is negative.)

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Diego is trying to lift a piano to the second floor of his house. Diego uses a pulley system and giv...
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