Draw a graph for acceleration against time for a uniformly accelerated motion. How can it be used to find the change in speed in a certain interval of time?

Draw a velocity-time graph for the free fall of a body under gravity, starting from rest $\left(\mathrm{g}=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$.

Figure (a) shows the displacement-time graph for the motion of a body. Use it to calculate the velocity of a body $t=1 \mathrm{s}, 2 \mathrm{s}$ and $3 \mathrm{s}$, then draw the velocity-time graph for it in figure (b).

Figure shows the displacement of a body at different times

Calculate the average velocity during the time interval $5 \mathrm{s}$ to $9 \mathrm{s}$.