Question

The distance $\left(s\right)$ - time $\left(t\right)$ graph of a particle is as shown in the figure below. In which of the following sections, the speed of the particle is zero?

Answer 1

We know that, slope of $s-t$ graph gives speed.

In position $\text{AB}$ the graph is parallel to $t$ - axis.

$\therefore$ slope is equal to zero.

Thus, the speed of the particle is zero.

Along $\text{OA}$, the speed of the particle is constant as slope is constant.

Along $\text{BC}$, the speed of the particle is constant as slope is constant.

Hence, option (b) is the correct alternative.