problem02_27 solution

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

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Unformatted text preview: 2.27: a) speeding up: x - x0 = 1320 ft, v0 x = 0, t = 19.9 s, a x = ? x - x0 = v0 x t + 1 a x t 2 gives a x = 6.67 ft s 2 2 slowing down: x - x0 = 146 ft, v0 x = 88.0 ft s , v x = 0, a x = ? 2 2 v x = v0 x + 2a x ( x - x0 ) gives a x = -26.5 ft s 2 . b) x - x0 = 1320 ft, v0 x = 0, a x = 6.67 ft s , v x = ? 2 2 v x = v0 x + 2a x ( x - x0 ) gives v x = 133 ft s = 90.5 mph. a x must not be constant. 2 c) v 0 x = 88.0 ft s, a x = -26.5 ft s , v x = 0, t = ? v x = v0 x + a x t gives t = 3.32 s. 2 ...
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