Question

Figure shows the displacement of a body at different times. Calculate the velocity of the body as it moves for time interval $7$ s to $9$ s.

Answer 1

We know, the slope of the displacement-time graph represents velocity.
So, the velocity of the body between $7\text{s}$ to $9\text{s}$,
$\overrightarrow{v}=$ Slope of line
$=\frac{\Delta Y}{\Delta X}=\frac{(7-3)m}{(9-7)s}=2m{s}^{-1}$
Velocity of the body between $7\text{s}$ to $9\text{s}$ is $2m{s}^{-1}$.