For a particle moving along straight line with constant acceleration (a), 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.
(i) Velocity is decresing with time (i.e., acceleration in negative)
(ii) Initial velocity is negative but acceleration is positive

Explanation

We have the relation `v=ut+at`. If are compare this relation with `v=mx+c=c+mx`, it is straight line
(i) We have `v=u+at`.
Compare weith `y=c+mx`
Have u is positive and a in negative. Hence the straight line should have positive intercept and negative slope.
The graph should be
(ii) Here initial velocity in negative and acceleration is should have positive slope and negative intercept.