Results are out! Find what you need...fast. Get quick advice or join the chat
x

Unlock these great extras with your FREE membership

  • One-on-one advice about results day and Clearing
  • Free access to our personal statement wizard
  • Customise TSR to suit how you want to use it

c2 Geometric progression

Announcements Posted on
Find your uni forum to get talking to other applicants, existing students and your future course-mates 27-07-2015
Win top prizes in our mega results day giveaway... 24-07-2015
  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:	32 
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:	32 
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
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Poll
Do you think you'll do better or worse than your predicted grades?
New on TSR

Results are coming...

No sweat. Here's all you need to make sure you're ready

Study resources
x

Think you'll be in clearing or adjustment?

Hear direct from unis that want to talk to you

Get email alerts for university course places that match your subjects and grades. Just let us know what you're studying.

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