Give an expression for the speed of an athlete if he takes time $t$ to complete one round of a circular track of radius $r$.

Area under a speed-time graph is equal to the

$(a)$ Differentiate between distance and displacement.
$(b)$ Under what conditions is the magnitude of average velocity of an object equal to its average speed?

What conclusion can you draw from the displacement$-$time graph of a body as shown below?

$A$ car travels $100\, km$ east and then $100\, km$ south. Finally,it comes back to the starting point by the south-east route. Throughout the journey the speed is constant at $60\, km\, h^{-1}$. The average velocity for the whole journey if the time taken is $3.3\, h$ is

The branch of Physics which deals with the motion of objects while taking into consideration the cause of motion is