Results 1 to 3 of 3

Math Help - [SOLVED] acceleration question

  1. #1
    Junior Member
    Joined
    Jul 2008
    From
    Cyprus
    Posts
    45

    [SOLVED] acceleration question

    In a 1500 metre race, runner A sets off at a constant speed of 5m/s Runner Bsets off 0 seconds later.

    i) Calculate the speed at which runner B needs to run in order to finish equal first with runner A

    ii) After 2 laps (800m) Runner A notices that B is catching up. Assuming that B is unable to increase his speed to respond how fast mut A run in order to win by 10 metres.

    I worked out using v=s/t that runner B needs to run at 5.56m/s in order to finish equal first. Its the second question that i'm having problems with.

    Initially i thought i had solved it using v=s/t again, but i realise that that is wrong because I cant just half the total time for A because it will be different now that he increases his velocity.

    If someone can point me in the right direction that would be great
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member Aryth's Avatar
    Joined
    Feb 2007
    From
    USA
    Posts
    652
    Thanks
    2
    Awards
    1
    You sure that runner B sets off 0 seconds later?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Jul 2008
    From
    Cyprus
    Posts
    45
    Aww Crap! My keyboard is rubbish, thats meant to be 30 secs later
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] finding angular acceleration
    Posted in the Math Topics Forum
    Replies: 0
    Last Post: April 20th 2010, 02:48 PM
  2. Replies: 0
    Last Post: March 21st 2009, 04:40 AM
  3. Need help with an acceleration question
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: February 23rd 2009, 02:09 PM
  4. Acceleration Question
    Posted in the Advanced Applied Math Forum
    Replies: 4
    Last Post: October 30th 2007, 10:02 AM
  5. Question about Acceleration
    Posted in the Calculus Forum
    Replies: 13
    Last Post: April 2nd 2007, 09:21 PM

Search Tags


/mathhelpforum @mathhelpforum