Physics - Kinematics Question with Solution | TestHub

Its average velocity during the 12 seconds interval is $\frac{17}{6}\mathrm{m}/\sec$.

It's velocity for the first 3 sec is uniform and is equal to $4\mathrm{m}/\sec$.

The body has a constant acceleration between $\mathrm{t}=8\sec$ and $\mathrm{t}=12\sec$.

The body has a uniform velocity from $t=8\sec$ to $t=12\sec$.