Write true or false for the following statements

A motion is said to be uniform, if a body undergoes equal displacements in equal intervals of time.

$(a)$ What is acceleration ? Write its $SI$ unit.

$(b)$ Draw velocity-time graph, when an object has

$(i)$ uniformly accelerated velocity

$(ii)$ uniformly retarded velocity.

Study the speed$-$time graph of a car below and answer the following questions

$(a)$ What type of motion is represented by $OA$ ?

$(b)$ Find acceleration from $B$ to $C$.

$(c)$ Calculate the distance covered by the body from $A$ to $B$.

Identify what do the graphs shown below indicate ?

A body is moving along a circular path of radius $R$. Find the displacement of the body when it completes half a revolution.