Basic Physics question, find average acceleration and velocity?

  • Thread starter ADH
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  • #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!
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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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!
Please post your work.

(Hint: Recall your kinematic equations of motion)
 
  • #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.
 
  • #4
rock.freak667
Homework Helper
6,230
31
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.

You have these formulas

x=v0t+0.5at2

v=v0+at

v2=v02-2ax

Which equation has acceleration, time and distance in it?
 
  • #5
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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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