Posted by Abdela said yimer on Saturday, January 21, 2012 at 7:08pm.
Be more careful where you put your periods and capitalized letters. "How" starts your question and should be capitalized. "When" does not.
You probably meant:
How far has the ball traveled when it hits the ground for the fifth time?
The answer is
16 + 2*8 + 2*4 + 2*2 + 2*1 = 46 m
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