Question

An athlete complete one round of a circular track of diameter 200meter in 40second what will be the distance covered and the displacement at the end of 2minutes 20second

Answer 1

Answer:

Distance = 2198 m ; Displacement = 314m.

Explanation:

Diameter = 200m

Radius = D/2

= 100 m

He completes each round in 40 s.

Total time = 2 mins 20s

= 140 s

So,

No. of rounds he will complete in 140 sec = 140/40

= 3.5

Each round will be the circumference of the round track = Total Distance Covered = 2$\pi$r*3.5 m

= 2198m

Hence,

The Displacement after 3 rounds will be 0m as the athlete would be at his initial position. So, the rest displacement would be:

= 2$\pi$r*0.5 m

= 314 m