Calculate the sprinters average acceleration

[jeahomgrajan]

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

Homework Equations

average acceleration=change in velocity/elapsed time

The Attempt at a Solution

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

 

[Dick]

Your velocities (and acceleration) are vectors. They have a direction. What's vf-vi if vf=4m/s [n] and vi=6m/s ?

 

[jeahomgrajan]

yeah i can jjust solve it, suppose i needed to change km/h/s to m/s^2

 

[Dick]

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.

 

[Snazzy]

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.

 

[jeahomgrajan]

yeah i know I am just asking generally