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1. A man pushes back on a 280 kg piano with a force of 421 N as it slides 4.3 m down a 30 degree incline. The work done by the man is -1812 J, friction is -4087 J, and gravity is 5899 J, resulting in zero net work. 2. The work done by a force that varies from 0 to 10 m is 2800 J, and from 0 to 15 m is 2100 J. 3. For Jane swinging on a vine, her maximum height is 1.6 m, and the length of the vine does not affect this.

Author

JoonSmith

Language

EN