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Acceleration question

  1. Sep 7, 2015 #1
    • Poster has been reminded that they need to show some effort when posting schoolwork problems
    1. What acceleration would be needed by a car speeding up from 10 m/s to 15 m/s in 80 m?

    2. The equations I have at my use right now are:
    V = at
    D = (1/2)(a)(t)^2
    T = square root of 2D / A
    A = change in velocity / time

    3. I honestly can't wrap my mind around how to solve this
    Last edited by a moderator: Sep 7, 2015
  2. jcsd
  3. Sep 7, 2015 #2


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    Welcome to PF!

    Your equations are valid when the initial velocity is zero. It is not the case in the problem.
  4. Sep 7, 2015 #3
    Can't you use vf2 = vi2 + 2ad ?

    You have vf, vi, d, and now you will have to find a.

    Last edited: Sep 7, 2015
  5. Sep 7, 2015 #4


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    Don't you need to square those velocities ?
  6. Sep 7, 2015 #5
    i edited it now (Y)
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