Posted by Zach on Monday, May 6, 2013 at 10:05am.
A rubber ball is thrown straight down from a height of 244 feet at speed of 80 feet per second. If the ball always rebounds with onefourth of its impact speed, what will be the speed of the ball the third time it hits the ground?
My Answer is:
1/4*80=60
1/4*60=45
1/4*45=33.75
1/4*33.75=25.31 for the speed
Or I need to use some kind of formula? Please help me.

Math  MathMat, Monday, May 6, 2013 at 10:17am
I am not sure what the formula is, but I can tell you that 1/4 multiplied by 80 is not 60. It would be 20. 60 is 3/4 of 80.

Math  Zach, Monday, May 6, 2013 at 10:58am
Yes what I meant is that it decreased 1/4 of every its impact, so therefore the answer would be 60 mph after first impact.
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