problem07_47

University Physics with Modern Physics with Mastering Physics (11th Edition)

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7.47: a) Use work-energy relation to find the kinetic energy of the wood as it enters the rough bottom: 2 1 K U = gives J. 4 . 78 1 2 = = mgy K Now apply work-energy relation to the motion along the rough bottom: J 4 78 ; 0 , 1 2 1 2 k other 2 2 other 1 1 . K U U K mgs W W U K
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Unformatted text preview: W U K f = = = =-= = + = + + ; J 4 . 78 k =-mgs solving for s gives m. . 20 = s The wood stops after traveling 20.0 m along the rough bottom. b) Friction does J 4 . 78-of work....
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