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July 4, 2015

Homework Help: Math- Check over please

Posted by Mae on Monday, January 5, 2009 at 9:17pm.

A ball is dropped from a height of 3m and bounces on the ground. At the top of each bounce, the ball reaches 60% of it's previous height. Calculate the total distance travelled by the ball when it hits the ground the fifth time.

Could you please check over my answer?

Sn= a(r^n-1)
--------
r-1
= 3(0.6^5 -1 )
-----------
0.6-1
= 6.9168

That is the answer i get, but at the back of the book the answer is 10.8m. Can you correct what im doing wrong? TIA

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