Question

In the figure, the displacement time graph of a body is shown at different time-intervals. Calculate the velocity of the body as it moves for
$\left(i\right)0to5s$,
$\left(ii\right)5sto7s$ and
$\left(iii\right)7sto9s$.

• A. $\left(i\right)1.2m{s}^{-1}\left(ii\right)0m{s}^{-1}\left(iii\right)1m{s}^{-1}$
• B. $\left(i\right)0.6m{s}^{-1}\left(ii\right)0m{s}^{-1}\left(iii\right)2m{s}^{-1}$
• C. $\left(i\right)0m{s}^{-1}\left(ii\right)0.6m{s}^{-1}\left(iii\right)4m{s}^{-1}$
• D. $\left(i\right)0.3m{s}^{-1}\left(ii\right)1m{s}^{-1}\left(iii\right)1.2m{s}^{-1}$

Answer 1

The correct option is B $\left(i\right)0.6m{s}^{-1}\left(ii\right)0m{s}^{-1}\left(iii\right)2m{s}^{-1}$

$Velocity,v=\frac{Displacement,d}{Time,t}$
$\left(i\right)$ $v=\frac{3m}{5s}=0.6m/s$
$\left(ii\right)$ $v=\frac{0m}{2s}=0m/s$
$\left(iii\right)$ $v=\frac{7m-3m}{2s}=2m/s$