A student drops a rock from a bridge to the water 12m below. How many seconds does it take the rock to hit the water?

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13-12-2016
Physics

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A student drops a rock from a bridge to the water 12m below. How many seconds does it take the rock to hit the water?

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Multiple Answer. Solve each equation A. f + 2/9 = 9 1/9 B. f = 7 8/9 C. f = 8 7/9

mathssydney mathssydney · Answer 1 · 2016-12-13T01:19:22+01:00

mathssydney mathssydney

13-12-2016

r = [tex] \frac{g t^{2} }{2} [/tex]
r - displacement or height
t - time taken
g = 10 m/s-2
t = square root from 2r/g = [tex] \sqrt{ \frac{2 x 12}{10} } [/tex] = 1.5 seconds

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