problem02_71 solution

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

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2.71: a) Travelling at s m 20 , Juan is m 21 ) s 80 . 0 )( s m 20 ( m 37 1 = - = x from the spreader when the brakes are applied, and the magnitude of the acceleration will be 1 2 1 2 x v a = . Travelling at s m 25 , Juan is m 17 ) s 80 . 0 )( s m 25 ( m 37 2 = - = x from the spreader, and the speed of the car (and Juan) at the collision is obtained from 2 2 2 2 1 2 2 1 2 0 2 1 2 1 2 0 2 2 0 2 s m 301 m 21 m 17 ) s m 20 ( ) s m 25 ( 2 2 2 = - = - = - = -
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Unformatted text preview: x x v v x a v v x x x x x and so s m 4 . 17 = x v . b) The time is the reaction time plus the magnitude of the change in speed ) ( v v-divided by the magnitude of the acceleration, or s. 1.60 m) 21 ( ) s m 20 ( s m 4 . 17 s m 25 2 ) s 80 . ( 2 2 1 2 reaction flash =-+ =-+ = x v v v t t...
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  • Division, 20 M, 17 m, 17.4 M, 2 21 m

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