Convert $18$ degrees into radians.

For a particle moving along a straight line with constant acceleration $\left(a\right)$, we define velocity of the particle with time as, $v=u+at$ ($u=$ initial velocity).

Draw the velocity-time graph of the particle in following situations.

$\left(\mathrm{i}\right)$ Velocity is decreasing with time (i.e., acceleration in negative).

$\left(\mathrm{ii}\right)$ Initial velocity is negative, but the acceleration is positive.