Results are out! Find what you need...fast. Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

c2 Geometric progression

Announcements Posted on
The Grow your Grades contest is here, join in to help each other achieve your study goals 22-01-2015
  1. Offline

    ReputationRep:
    Hey Ive come across this question and I have no idea how they got their answer and why they did it.

    A ball is dropped from a height of 2 metres. After each bounce it rebounds to a height 0.8 times the height that it reached after the last bounce.

    (ii)
    Find the total distance travelled by the ball before it comes to rest.

    Click image for larger version. 

Name:	maths qestoins.jpg 
Views:	31 
Size:	27.3 KB 
ID:	146951

    how did they derive this equation? 2+2sum infinite ... I understand the +2 part as thats the height it dropped from but otherwise I am confused.

    Thanks in advance for help
  2. Offline

    ReputationRep:
    (Original post by Polioz)
    Hey Ive come across this question and I have no idea how they got their answer and why they did it.

    A ball is dropped from a height of 2 metres. After each bounce it rebounds to a height 0.8 times the height that it reached after the last bounce.

    (ii)
    Find the total distance travelled by the ball before it comes to rest.

    Click image for larger version. 

Name:	maths qestoins.jpg 
Views:	31 
Size:	27.3 KB 
ID:	146951

    how did they derive this equation? 2+2sum infinite ... I understand the +2 part as thats the height it dropped from but otherwise I am confused.

    Thanks in advance for help
    The ball rebounds after it hits the surface, it first goes up then moves down, hence it is 2 times the sum to inifinity, we need to consider both the motions, of it moving up as well as moving down.
  3. Offline

    ReputationRep:
    The ball has to fall from the height it gets to aswell....
  4. Offline

    ReputationRep:
    (Original post by raheem94)
    The ball rebounds after it hits the surface, it first goes up then moves down, hence it is 2 times the sum to inifinity, we need to consider both the motions, of it moving up as well as moving down.
    ahaa that makes sense thank you

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: May 10, 2012
New on TSR

Everyday things you can't do

Why do they make everything so difficult?

Article updates
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.