What can we conclude about the motion of a body depicted by following velocity$-$time graphs ?

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

A circular cycle track has a circumference of $314\, m$ with $A B$ as one of its diameter. $A$ cyclist travels from $A$ to $B$ along the circular path with a velocity of constant magnitude $15.7\, m s ^{-1}$. Find the

$(a)$ distance moved by the cyclist.

$(b)$ displacement of the cyclist, if $A B$ represents north$-$south direction.

$(c)$ the average velocity of the cyclist.

$(a)$ Differentiate acceleration from velocity.

$(b)$ Can a body have acceleration without change in magnitude of velocity ? Explain with an example.

$(c)$ A motor boat starting from rest on a lake accelerates in a straight line at a constant rate of $3\, m s ^{-2}$ for $8 \,s$. How far does the boat travel during this time ?

Study the given graph and answer the following questions

$(i)$ Which part of the graph shows accelerated motion ?

$(ii)$ Which part of the graph shows retarded motion ?

$(iii)$ Calculate the distance travelled by the body in first $4$ seconds of journey graphically.