1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Race car velocity problem

  1. Feb 7, 2005 #1
    A race car moves such that its position fits the relationship
    x(t) = (4.4 m/s) t + (0.91 m/s^3) t^3 (yes cubed)
    where x is measured in meters and t in seconds.Approximate the instantaneous velocity at t = 2.6 s, using a time interval of 0.2 s. Answer
    in units of m/s.

    i am just stuck and dont even know where to start
     
  2. jcsd
  3. Feb 7, 2005 #2
    ok, the velocity is
    [tex] \frac{\Delta x} {\Delta t} [/tex]

    now the question come down to what is delta x and delta t
    hope you can come out the answer
     
  4. Feb 7, 2005 #3

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Take the time origin [itex] t_{0} [/itex] to be 0.

    Daniel.
     
  5. Feb 7, 2005 #4
    but what is Xo and X?
     
  6. Feb 7, 2005 #5

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    Kay.
    [tex] x_{0}=x(t_{0})=x(0) [/tex]

    [tex] x=x(2.6) [/tex]

    Daniel.
     
  7. Feb 7, 2005 #6
    ok i got all that, but what is still confusing me is the "time interval" what do i do with that
     
  8. Feb 7, 2005 #7

    what is the time interval for???
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Race car velocity problem
  1. Race car G problem (Replies: 3)

Loading...