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Math

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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 - ,

    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 - ,

    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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