The velocity-time graph in case of a stone thrown vertically upwards in the air and returning back to the earth is shown by

From the velocity-time graph given alongside, calculate the acceleration from $\mathrm{A}$ to $\mathrm{B}$.

From the velocity-time graph given alongside, calculate the retardation from $\mathrm{B}$ to $\mathrm{C}$.

From the velocity-time graph given below, calculate the distance covered in the region $\mathrm{ABCD}$.

From the velocity-time graph given alongside, calculate the average velocity from $\mathrm{C}$ to $\mathrm{D}$.

A body is moving in a straight line and its displacement at various instants of time are given in the following table:

The graph shows the positions of a body at different times. Calculate the speed of the body as it moves from $\mathrm{A}$ to $\mathrm{B}$.