Cinderella11 Cinderella11
  • 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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mathssydney
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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