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 one-fourth 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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