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November 23, 2014

November 23, 2014

Posted by **Derek** on Tuesday, September 16, 2008 at 2:34am.

- physics -
**Anonymous**, Tuesday, September 16, 2008 at 4:31amtime that ball is in the air = t

time that stone is in the air =(t-2)

distance ball goes up = 20 t - 4.9 t^2

distance stone goes up = 24(t-2)-4.9 (t-2)^2

so

20 t -4.9 t^2 = 24 t - 48 - 4.9(t^2 - 4 t + 4)

20 t - 4.9 t^2 = 24 t - 48 - 4.9 t^2 + 19.6 t - 19.6

solve quadratic for t

use t in distance equation for either ball or stone to get height

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