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September 20, 2014

September 20, 2014

Posted by **Chelsea** on Wednesday, October 31, 2012 at 9:22am.

- physics -
**Elena**, Wednesday, October 31, 2012 at 1:36pmWithout air resistance

KE=PE

mv²/2=mgh

h=v²/2g =27²/2•9.8 = 37.2 m

(mgh-mgh1)/mgh = (h-h1)/h= (37.2-16.3)/37.2=0.56

56%

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