Question

Whats the distance covered and displacement of an athlete moving in a circular track of radius 7m after covering half round?

Answer 1

The perimeter of a circle is 2πr,

But the athlete has covered only half. So, the distance covered by the athlete will be,

Distance = 2×π×r/2 = π×r = 7×π = 21.9911485751285 m

But, the displacement is the shortest distance b/w the initial and the final position. If you draw a straight line b/w initial position and the final position since, the athlete has covered only half of the circles circumference, the displacement will be the diameter of the circle.

Hence,

Displacement = 2×r = 2 × 7 = 14 m

Please mark me as brainiest

Answer 2

displacement= diameter= 2×7=14m.
distance of 1 round =circumference of circle
circumference=2πr=2×22÷7×7=44m
then, distance when athelete cover half round = 44÷2= 22m