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: Help with velocity problem

  1. Apr 25, 2005 #1
    The position of an object moving along x-axis is given by x=a+b(t*t) where a =8.5m, b=2.5m/(s*s) and t is time. What is the velocity at t=2s? I think differential calculus should be used :confused:
  2. jcsd
  3. Apr 25, 2005 #2
    If that x equation is x = a+bt^2, then just differentiate wrt to time to get velocity.
  4. Apr 25, 2005 #3
    Yupp, just get dx/dt and then make t = 2.
  5. Apr 26, 2005 #4
    Is it this:
    dx/dt = d(a+bt^2)/dt
    After this what should I do?
  6. Apr 26, 2005 #5

    James R

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Do you know how to differentiate?

    If [itex]y = a + bx^2[/itex], what is dy/dx?

    You have [itex]x = a + bt^2[/itex], and you know v=dx/dt, so what is v(t)?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook