The following table shows the position of three persons between $8.00\, am$ to $8.20\, am$.
TimePosition of Person $A$ $(km)$Position of Person $B$ $(km)$Position of Person $C$ $(km)$
$8.00\, am$$0$$0$$0$
$8.05\, am$$4$$5$$10$
$8.10\, am$$13$$10$$19$
$8.15\, am$$20$$15$$24$
$8.20\, am$$25$$20$$27$

$(i)$ Who is moving with constant speed?
$(ii)$ Who has travelled the maximum distance between $8.00\, am$ to $8.05\, am$?
$(iii)$ Calculate the average speed of person $A$ in $km\, h^{-1}$.

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(N/A) $(i)$ Person $B$ is moving with constant speed because he travels an equal distance of $5\, km$ in equal intervals of time (every $5\, minutes$).
$(ii)$ Person $C$ has travelled the maximum distance, which is $10\, km$ between $8.00\, am$ and $8.05\, am$.
$(iii)$ Average speed of person $A = \frac{\text{Total distance travelled by } A}{\text{Total time taken}}$
$= \frac{25\, km}{20\, min} = \frac{25\, km}{(20/60)\, h} = \frac{25 \times 60}{20}\, km\, h^{-1} = 75\, km\, h^{-1}$.

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What kind of motion of a body is represented by the graphs given below?

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