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Homework Help: Basic Physics question, find average acceleration and velocity?

  1. Sep 25, 2010 #1

    ADH

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    Branden runs for a ball from a dead stop. It takes him 3 sec to reach it after traveling 10 meters.

    What was his average acceleration?

    What velocity did he acheive when he caught the ball?

    Thank you!
     
  2. jcsd
  3. Sep 25, 2010 #2

    rock.freak667

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    Homework Helper

    Please post your work.

    (Hint: Recall your kinematic equations of motion)
     
  4. Sep 25, 2010 #3

    ADH

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    My attempt was this. I found the velocity, I think.

    For velocity I have 3.333 meters/second.

    I was not sure how to find acceleration, or what formula to use.

    My teacher gave us this formula: velocity = velocity(sub zero) + at . So should I make a permuatation out of this formula to give me: a = (velocity - velocity(sub zero)) / t ?

    So then a = 3.333m/s - (initial velocity) / time

    I'm pretty confused. Thanks for helping.
     
  5. Sep 26, 2010 #4

    rock.freak667

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    You have these formulas

    x=v0t+0.5at2

    v=v0+at

    v2=v02-2ax

    Which equation has acceleration, time and distance in it?
     
  6. Sep 26, 2010 #5
    Try organizing your data, see what you have and what is missing/required.

    For example:

    Vinitial=0 m/s t=3s d=10m a=? Vfinal=?

    These formulas should help.

    d= 1/2 (Vi+Vf)t

    Vf= Vi + at

    d=Vi(t) + 1/2 a(t^2)

    G'luck!
     
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