Let's calculate the average acceleration. It is the rate of changing speeds. Hence, we need to calculate the difference of speeds. 10-6=4 m/s. The rate is now [tex] \frac{4m/s}{2s} =2m/s^2[/tex].
In general, the formula for the mean acceleration between two times 1 and 2 is given by:
[tex] \frac{u_2-u_1}{T} [/tex] where v1 and v2 are the speeds at the respective points and T is the time interval between them.