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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 ?
Solution
$(a)$ The total distance is $200 \times 4=800 m$.
$(b)$ Since they return to the point from where they started, therefore, their displacement is zero.
$(c)$ Since throughout the race there velocity goes on changing, hence their motion is nonuniform.
$(d)$ The displacement and distance travelled are not equal.
