Posted by **Mae** on Monday, January 5, 2009 at 9:17pm.

A ball is dropped from a height of 3m and bounces on the ground. At the top of each bounce, the ball reaches 60% of it's previous height. Calculate the total distance travelled by the ball when it hits the ground the fifth time.

Could you please check over my answer?

Sn= a(r^n-1)

--------

r-1

= 3(0.6^5 -1 )

-----------

0.6-1

= 6.9168

That is the answer i get, but at the back of the book the answer is 10.8m. Can you correct what im doing wrong? TIA

- Math- Check over please -
**bobpursley**, Monday, January 5, 2009 at 9:57pm
first fall 3

second up and fall=2*3*.6=3.6

third up and fall= 2*3*.6^2=2.16

fourth up and fall=2*3*.6^3=you do it

and that agrees with the book.

- Math- Check over please -
**Mae**, Monday, January 5, 2009 at 9:58pm
but is there any way i can apply that to the formula given?

- Math- Check over please -
**bobpursley**, Monday, January 5, 2009 at 10:24pm
look at my work. Notice the 2 in it? Did your think that the distance was up and down?

If you start on the ground, go up to 3 and back down, you can use your formula but subtracting the initial three upwards.

Sn=6(.6^4-1)/(.6-1) -3

= you do it

Notice you only repeat it four times, it hits the ground at the end of the fourth bounce. Think about that. THe first bounce it starts the first repetition and ends on the sound bounce, and so on.

## Answer this Question

## Related Questions

- math - a ball is dropped from a height of 3m and bounces on the ground . At the ...
- 5th grade math - On each bounce a ball reaches 4/5 of the height of its previous...
- Math - I need some help with these quesitons 1. a1 = -1, and an = 4/3an-1 for n...
- Math - I need some help with these quesitons 1. a1 = -1, and an = 4/3an-1 for n...
- math - the height that a ball bounces varies directly as the height from which ...
- 11 - A ball is dropped vertically from height of 30 meters after bounces.The ...
- math - a ball is dropped from a height of 5m. after each bounce, the ball rises ...
- maths lit - a ball is dropped from a height of 2r1/3 meters. It bounces to 3/4 ...
- math - i am having difficulties figuring this out.... a ball has dropped from a ...
- science - Science Experiment Determine a mathematical modelwhich describes the ...

More Related Questions