problem03_67

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

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3.67: Take y + to be downward. a) Use the vertical motion of the boulder to find the time it takes it to fall 20 m to the level of the surface of the water. ? m, 20 , m/s 80 . 9 , 0 0 2 0 = = - = = t y y a v y y s 02 . 2 gives 2 2 1 0 0 = + = - t t a t v y y y y The rock must travel 100 m horizontally during this time, so m/s. 49 s 2.20 m 100 0 0 = = - = t x x v x b) The rock travels downward 45 m in going from the cliff to the plain. Use this
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Unformatted text preview: vertical motion to find the time: ? m, 45 , m/s 80 . 9 , 2 = =-= = t y y a v y y s 03 . 3 gives 2 2 1 = + =-t t a t v y y y y During this time the rock travels horizontally m 150 s) m/s)(3.03 49 ( = = =-t v x x x The rock lands 50 m past the foot of the dam....
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This document was uploaded on 02/04/2008.

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