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!

Homework Help: Position of a particle

  1. Apr 7, 2007 #1
    1. The problem statement, all variables and given/known data
    The position of a particle is given by the function x = ( 8t^3 - 3t^2 + 5) m, where t is in s.
    (a) At what time or times does vx = 0 m/s?

    (b) What are the particle's position and acceleration at t1?

    What are the particle's position and acceleration at t2?

    2. Relevant equations
    v1 = v0 + at
    x1 = x0 + v0 + (1/2)at^2
    vx = dx/dt
    a = dv/dt

    3. The attempt at a solution
    Quite honestly, I'm not sure where to begin with this problem. If someone could help me to start it that would be greatly appreciated, thanks!
  2. jcsd
  3. Apr 7, 2007 #2


    User Avatar
    Homework Helper

    You know that v = dx/dt, and a = dv/dt. So for starters, take the derivatives.
  4. Apr 7, 2007 #3


    User Avatar
    Homework Helper

    these are equation for constant acceleration. for your case acceleration is time dependent so can't use these
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook