Answer
The average acceleration is $~~0$
Work Step by Step
On the velocity versus time graph, we can see:
At $t = 1.0~s,$ the velocity $v = 2.0~m/s$
At $t = 5.0~s,$ the velocity $v = 2.0~m/s$
We can find the average acceleration between $t = 1.0~s$ and $t = 5.0~s$:
$a_{ave} = \frac{\Delta v}{\Delta t} = \frac{2.0~m/s-2.0~m/s}{5.0~s-1.0~s} = \frac{0}{4.0~s} = 0$
The average acceleration is $~~0$.
