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

Since the athlete is following a semi-circular path, the distance traveled shall be the perimeter of the semicircle:1/2 (2π r)=πr=3.14x70=219.8 m

  where r is the radius of the semicircle along which the athlete running.

Displacement: Since the athlete is starting from one end of the semicircle and reaching the other end, his position is displaced by the radius of the semicircle, what is 70m.

• Distance travelled:219.8m

• Displacement=radius of the semicircle=70m

Answer 2

Answer:

distance = 220m

displacement = 140m

Explanation:

distance : 1/2 *2πr= πr so,

22/7*70=220m

displacement: diameter of the semi-circle =70*2=140m