Posted by **Anonymous** on Monday, August 8, 2011 at 11:52am.

Chap. 7, #36. (II) A ball is dropped from a height of 1.50 m and rebounds to a height of 1.20 m. Approximately how many rebounds will the ball make before losing 90% of its energy?

- Physics 1 (college) -
**bobpursley**, Monday, August 8, 2011 at 3:27pm
energy retained each bounce: 1.2/1.4=6/7

(6/7)^n=.1

log of each side

n log (6/7)= -1

solve for n.

- physics -
**bobpursley**, Monday, August 8, 2011 at 9:21pm
change that fraction to 1.2/1.5 or 4/5. I misread.

- Physics 1 (college) -
**john**, Monday, March 3, 2014 at 5:49pm
I don't understand where you got .1 and then -1 from. Can you explain that?

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