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OpenStudy (anonymous):
a ball falls from a roof of height 10cm.it bounces back 4/5 of previous height.how many times does the ball passes in front of the window whose bottom edge is 5cm and top edge is 6 cm?
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OpenStudy (mathmate):
|dw:1424259522376:dw| It bounces up by the same ratio (0.8) every time.
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