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Unformatted text preview: 84 Chapt. 8 Potential Energy and Mechanical Energy initially at its equilibrium extension. The spring is aligned with the ground and the Jerrys path. Jerry compresses the spring by a displacement s at which point Jerry is instantaneously at REST (i.e., his final kinetic energy is zero). The GROUND is not frictionless: it has kinetic coefficient for friction ki = 0 . 300. The whole problem is 2dimensional. What is s ? HINT: Draw a diagram. a) 1 . 25 m. b) 1 . 50 m. c) 1 . 75 m. d) 2 . 00 m. e) 2 . 25 m. FullAnswer Problems 008 qfull 00210 1 3 0 easy math: gravity PE to KE, spanner 1. You drop a 2 . 0 kg spanner from rest to a friend standing on the ground which 10 m below the drop height. She will catch the spanner 1 . 5 m above the ground. Neglect air drag. a) Whats the work done by gravity in the drop? b) Whats the change in gravitational potential energy in the drop? c) Using an energy conservation calculation find the speed of the spanner as it reaches your friends hands.friends hands....
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 Fall '06
 Buchler
 Physics, Energy, Potential Energy

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