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its fourth bounce

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its fourth bounce

by sanju09 » Fri Jul 23, 2010 2:36 am
After being dropped a certain ball always bounces back to 2/5 of the height of its previous bounce. After the first bounce it reaches a height of 125 inches. How high (in inches) will it reach after its fourth bounce?
A. 20
B. 15
C. 8
D. 5
E. 3.2

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by outreach » Fri Jul 23, 2010 2:41 am
is it C
1st bounce=125
2nd bounce=2/5*125=50
3rd bounce=2/5*50=20
4th bounce=2/5*20=8
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