An artificial satellite is moving in a circular orbit of radius $42250 \, km$. Calculate its speed (in $m s^{-1}$) if it takes $24 \, h$ to revolve around the Earth.

An object has moved through a distance. Can it have zero displacement? If yes,support your answer with an example.

What does the odometer of an automobile measure?

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

$A$ train is travelling at a speed of $90\, km \,h^{-1}$. Brakes are applied so as to produce a uniform acceleration of $-0.5\, m s^{-2}$. Find how far (in $m$) the train will go before it is brought to rest.

Distinguish between speed and velocity.