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September 23, 2014

September 23, 2014

Posted by **Pat** on Monday, May 21, 2012 at 5:11pm.

The speed of sound through air at 20°C is v = 343 m/s.

- physics -
**Elena**, Monday, May 21, 2012 at 5:20pmDownward motion of the stone:

h =g•t1²/2, t1 =sqrt(2•h/g) = sqrt(2•150/9.8) = 5.5 s.

Upward motion of sound:

h = v•t2.

t2 = h/v = 150/343 =0.44s.

t =t1+t2 =5.5 +0.44 =5.94 s.

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