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September 21, 2014

September 21, 2014

Posted by **Marvin** on Saturday, July 14, 2012 at 3:16am.

- Physics -
**Elena**, Saturday, July 14, 2012 at 7:29amThe max height is

H= v²/2g =80²/2•9.8 = 326.53 m.

The time of upward motion is

t1 =v/g =80/9.8=8.16 s,

the time of downward motion is

t2=sqrt{2(H-h)/g}=sqrt{2(326.53-3)/9.8} =8.126.

The total time is

t=t1+t2 =8.16+8.126 =16.126 s.

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