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Calculate the sprinters average acceleration

1. Homework Statement
A sprinter has a velocity of 6.0m/s at t=3.0s.
Five seconds later he is moving north with a speed of 4.0m/s. calculate the sprinters average acceleration


2. Homework Equations

average acceleration=change in velocity/elapsed time

3. The Attempt at a Solution

t1=3.0s, v1=6.0m/s, t2=8.0s, v2=-4.0m/s
 

Answers and Replies

Dick
Science Advisor
Homework Helper
26,258
618
Your velocities (and acceleration) are vectors. They have a direction. What's vf-vi if vf=4m/s [n] and vi=6m/s ?
 
yeah i can jjust solve it, suppose i needed to change km/h/s to m/s^2
 
Dick
Science Advisor
Homework Helper
26,258
618
yeah i can jjust solve it, suppose i needed to change km/h/s to m/s^2
I think you are thinking of a different problem. There's no km/hr in this one.
 
458
0
yeah i can jjust solve it, suppose i needed to change km/h/s to m/s^2
Not sure how that relates to the question. They're already in standard units.
 
yeah i know im just asking generally
 

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