# Math

posted by .

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.

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### math

Let’s suppose you throw a ball straight up with an initial speed of 50 feet per second from a height of 6 feet. a.Find the parametric equations that describe the motion of the ball as a function of time. b.How long is the ball in …
2. ### Physics

Kevin stands at the edge of a cliff, holding one ball in each hand. He throws one of the balls straight up with speed v, and at the same time he throws the other ball straight down, also with speed v. Ignoring air resistance, which …
3. ### trig

Bob throws a ball straight up with an initial speed of 50 feet per second from a height of 6 feet. (a) Find parametric equations that describe the motion of the ball as a function of time. (Do this on paper. Your instructor may ask …
4. ### math

a ball is thrown upward at 64 feet per second from the top of an 80 feet high building. The height of the ball can be modeled by S(t) = -16t^2 + 64t + 80(feet), where t is the number of seconds after the ball is thrown. describe the …
5. ### math

An object that is falling or vertically projected into the air has it height, in feet, above the ground given by the formula below, where s is the height in feet, Vo is the original velocity of the object, in feet per second, t is …
6. ### Pre calc

Alice throws a ball straight up with an initial speed of 40 feet per second from a height of 5 feet?
7. ### Pre Calc

Alice throws a ball straight up with an initial speed of 40 feet per second from a height of 5 feet?
8. ### Calculus

The height, s, of a ball thrown straight down with initial speed 32 ft/sec from a cliff 48 feet high is s(t) = -16t^2 - 32t + 48, where t is the time elapsed that the ball is in the air. What is the instantaneous velocity of the ball …
9. ### physic

A ball is thrown straight upward and returns to the thrower's hand after 2.00 s in the air. A second ball thrown at an angle of 40.0° with the horizontal reaches the same maximum height as the first ball. (a) At what speed was the …
10. ### physics

A ball is thrown straight upward and returns to the thrower's hand after 2.00 s in the air. A second ball thrown at an angle of 40.0° with the horizontal reaches the same maximum height as the first ball. (a) At what speed was the …

More Similar Questions

Post a New Question