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September 21, 2014

September 21, 2014

Posted by **Melissa** on Saturday, December 17, 2011 at 12:50am.

- math -
**Steve**, Saturday, December 17, 2011 at 6:15amThis is just finding the sum of the sum of the series

-3 + 6*.6 + 6*.6*.6 + ...

We subtract off the 3 because the ball didn't start from the ground, so its first hop is only the downward part.

a = 6

r = 0.6

S5 = 6 (1-.6^5)/(1-.6)

= 6(2.3056) = 13.8336

S5 - 3 = 10.8336

Check: 3 + 3.6 + 2.16 + 1.296 + 0.7776 = 10.8336

- math -
**Anonymous**, Saturday, September 6, 2014 at 10:42ama ball is droped from a height of 30m above level ground. After each bounce it rises to three quarters of the height from which it fell. find,to the nearest metre, the total distance it has travelled when it strikes the ground for the 7th times

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