$A$ particle moves according to the equation $x = a + bt^2$,where $a = 15 \, cm$ and $b = 3 \, cm/s^2$. What is the velocity of the particle at $t = 3 \, s$ in $cm/s$?

The acceleration-time graph of a body is shown. The corresponding velocity-time graph of the same body is

The displacement of a particle as a function of time is shown in the figure. It indicates:

$A$ steel ball is released from rest a distance above a rigid horizontal surface and bounces several times. The diagram shows how its velocity varies with time. Which statement correctly explains why the areas $X$ and $Y$ are equal?

The $v-t$ plot of a moving object is shown in the figure. The average velocity of the object during the first $10$ seconds is...........$m/s$.

From the velocity-time graph of a particle moving in a straight line,decide which of the following is an incorrect statement.