5.28: a) The stopping distance is m. 53 ) s m 80 . 9 ( ) 80 .0 ( 2 ) s m 7 . 28 ( 2 2 2 2 k 2 2 = = μ = g v a v b) The stopping distance is inversely proportional to the coefficient of friction and proportional to the square of the speed, so to stop in the same distance the initial speed
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