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`        1. after striking the floor ,a ball rebounds 80% of the height from which it has fallen. find the total distance that it travels before coming to rest if it is dropped from a height of 120 cm.`
7 years ago

147 Points
```										Dear sougata
Total distance travel by ball is
S = 120 + 2*120*.8 + 2*120*(.8)2  + 2*120(.8)3 +.................∞
i have multiplied by 2 because ball travells two time first when ball move from flour to vertically upward and second when it come back  to flour.
S = 120 + 2*120*.8[ 1 + .8 + (.8)2+......∞]  in bracket we have infinite geometric progression
=120 + 192[ 1/(1-0.8)]
=120 + 192[5]
=1080   cm

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7 years ago
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