Which one of the following represents the displacement-time graph of two objects $A$ and $B$ moving with zero relative velocity?

The variation of velocity of a particle with time moving along a straight line is illustrated in the following figure. The distance travelled by the particle in $4 \; s$ is ......... $m$.

If a steel ball is dropped from a height onto a marble floor,what will the velocity-time graph look like?

The $x-t$ graph of a particle moving along a straight line is shown in the figure. The $v-t$ graph of the particle is correctly shown by:

The velocity $v$ of a body moving along a straight line varies with time $t$ as $v = 2 t^2 e^{-t}$,where $v$ is in $m/s$ and $t$ is in $s$. The acceleration of the body is zero at $t =$

Suggest a suitable physical situation for the following $x-t$ graph.