The displacement of a body is proportional to the cube of the time lapsed. The magnitude of the acceleration is

Can the displacement of a particle be zero when the distance travelled is not zero ?

$(a)$ Differentiate between distance and displacement.

$(b)$ Under what conditions is the magnitude of average velocity of an object equal to its average speed ?

A frog hops along a straight line path from point $'A^{\prime}$ to point ${ }^{\prime} B ^{\prime}$ in $10\, s$ and then turns and hops to point ${ }^{\prime} C^{\prime}$ in another $5\, s$. Calculate the average speed and average velocity of the frog for the motion between $(a)(A)$ to $(B)(b)(A)$ to $(C)($ through $B)$

Write true or false for the following statements

Velocity and speed are measured in different units.