$(a)$ Differentiate between uniform linear and uniform circular motion.

$(b)$ Write any four examples of uniform circular motion.

$(c)$ Is uniform circular motion is accelerated motion ?

A body can have zero average velocity but not zero average speed. Justify giving an example.

The velocity$-$time graph of a truck is plotted below

$(a)$ Calculate the magnitude of displacement of the truck in $15$ seconds.

$(b)$ During which part of the journey was the truck decelerating ?

$(c)$ Calculate the magnitude of average velocity of the truck.

The velocity-time graph of cars $A$ and $B$ which start from the same place and move along a straight road in the same direction is shown below

Calculate :

$(a)$ the acceleration of car $B$ between $2 \,s$ and $4\, s$.

$(b)$ the time at which both the cars have the same velocity.

$(c)$ the distance travelled by the two cars $A$ and $B$ in $8\, s$

$(d)$ Which of the two cars is ahead after $8\, s$ and by how much ?

What do uou understand by the term acceleration ? When is it positive and when is it negative ?