Question

a person completes a round of a circular tank of radius in 40s at the end of 2 Mon displacement will be​

Answer 1

Answer:

Explanation:

Circumference is = 2 pi r. Time is 40 s. Total distance is 2r pi x 3.5 = 7r pi. Total displacement will be = 2r since ball will be directly across the diameter .

Answer 2

Explanation:

Think of a circlular track of radius R....

Now divide this into four equal parts . As the athlete completes one round in 40 sec so he covers the boundry line of the each quadrant(Part) in 10 sec.

Suppose he starts at the top of the track when t=0 . Now he completes 1st loop at t=40 , second at t=40+40 = 1min 20 sec and the next one at 2 min. So at 2 minute the athlete has completed 2 loops of the circle and is at his initial position now in the next 20 second it is obvious that he is at the exact opposite side of the circle. The displacement will be equal to diameter. Given that radius is R so diameter i.e Displacement becomes 2R .

I tried to make it as simple as possible hope u understand