A body is moving, with a velocity of $10 \,m s ^{-1}$. If the motion is uniform, what will be its velocity after $10 \,s$ ?

What is meant by uniform motion ? Can you think of an example of a body in uniforim motion ?

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

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

$(i)$ uniformly accelerated velocity

$(ii)$ uniformly retarded velocity.

The position$-$time graph for the motion of a car is given below

$(i)$ How far the car tavelled in the time interval $2$ to $6 s ?$

$(ii)$ During which interval of time its speed was more?

$(iii)$ Calculate the average speed of the car.

In a long distance race, the athletes were expected to take four rounds of the track such that the line of finish was same as the line of start. Suppose the length of the track was $200\, m$.

$(a)$ What is the total distance to be covered by the athletes ?

$(b)$ What is the displacement of the athletes when they touch the finish line ?

$(c)$ Is the motion of the athletes uniform or nonuniform ?

$(d)$ Is the displacement of an athlete and the distance moved by him at the end of the race equal ?