Question

An athlete runs from one end to the other end of a semi circular track whose radius is 70m. what is the distance covered by the athlete and what is his displacement?

Answer 1

Answer:

2pi radius= circumference

2 x pi x 70 = 439.8m

semicircle = half a circle

0.5 x 439.8 = 219.9m

displacement should be 2 x the radius, aka the diameter. The start and end position intersect the "circle" because it's a semi circle.

2 x 70 = 140m

Explanation:

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Answer 2

Given:

it's a semi circular track having radius 70m.

so the distance covered will be the perimeter of the semi circle.

perimeter = πr + 2r

= 22/7× 70 + 2×70

= 220 + 140

= 360m

displacement will be the shortest distance covered, that is the diameter of the semicircle.

So, diameter = 2×70

= 140m