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April 21, 2015

April 21, 2015

Posted by **irna** on Saturday, April 23, 2011 at 3:28am.

- physics -
**drwls**, Saturday, April 23, 2011 at 9:21amSolve for the t when

first stone height = second stone height

300 - 4.9 t^2 = 75 t- 4.9 t^2

The "4.9" is g/2, in m/s^2

75 t = 300

t = 4 seconds

height = 300 - 4.9*16 = 226 m

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