How to find the average accleration on a velocity time graph

[wittlebittle]

My physics problem ask me to find the average acceleration on a velocity time graph. On the graph, velocity is at -6 constantly from 0 - 5 s.



I know that an question to use would be average accerlation = delta v/ delta t



The problem is I did that and I still got it incorrect on quest! I did -6 over 5s - 0s
The answer I got was -1.2 please help to tell me what I'm doing wrong and what equation I should be using! Thanks so much!

 

[Andrew Mason]

My physics problem ask me to find the average acceleration on a velocity time graph. On the graph, velocity is at -6 constantly from 0 - 5 s.
I know that an question to use would be average accerlation = delta v/ delta t
The problem is I did that and I still got it incorrect on quest! I did -6 over 5s - 0s
The answer I got was -1.2 please help to tell me what I'm doing wrong and what equation I should be using! Thanks so much!

If the velocity was -6 during that whole period, is there any change in velocity? So what is Δv? (hint: think of acceleration as the slope of a velocity-time graph).

AM