problem07_41

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

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7.41: a) 2 2 other 1 1 U K W U K + = + + 0 2 2 1 = = = K U U m 85.3 ft 280 with k other = = - = = s mgs, W W f μ The work-energy expression gives 0 k 2 1 2 1 = - mgs mv ; mph 50 s m 4 . 22 2 k 1 = = = gs v the driver was speeding.
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Unformatted text preview: a) 15 mph over speed limit so $150 ticket....
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