91Ó°ÊÓ

Velocity refers to the ratio of change in displacement with respect to time.

$v=\frac{dx}{dt}$

Where, are the displacement and time, respectively.

The velocity can be visualized as the slope of the x-t curve

Atpoint (IV) the value of the slope is zero because displacement is constant with time,therefore, thevelocity is zero.

At point (I) the displacement is increasing with time at a constant positive rate, which implies that the slope is constant and has a positive value. Therefore, the velocity is constant and positive.

At point (V) the displacement starts decreasing with time at a constant negative rate, which implies that the velocity has a negative and constant value.

At point (II) the slope is increasing with the positive value. Therefore, velocity will increase.

At point (III) the value of slope starts reducing as compared to the point (II), therefore it means that the velocity is decreasing, as the direction is opposite to that of the increasing velocity.