In which of the following cases of motion,are the distance moved and the magnitude of displacement equal?

Name the physical quantities denoted by:
$(i)$ The slope of the distance$-$time graph.
$(ii)$ The area under a velocity$-$time graph.
$(iii)$ The slope of a velocity$-$time graph.

$A$ body moves on three quarters of a circle of radius $r$. The displacement and distance The displacement and distance travelled by it are:

Under what conditions of motion,the distance covered by a body is equal to the magnitude of its displacement?

Can you suggest real-life examples of the motion of a body from the following velocity-time graphs?

Ali,while driving to school,computes the average speed for his trip to be $20 \, km \, h^{-1}$. On his return trip along the same route,there is less traffic and the average speed is $30 \, km \, h^{-1}$. What is the average speed for Ali's entire trip?