Question

An athlete complete One round of a circular track
of diameter 200 m in 40s What will be the distance
covered and the displacement at the end of 2 min 20s?
.
S​

Answer 1

Answer:

Given :-

Diameter of circular track = 200 m

Radius, r = 200/2 = 100 m

Time taken by athlete to complete one round = 40 seconds.

To Find :-

Distance covered = ??

Displacement = ??

Formula to be used :-

Speed = Distance/Time

Circumference of circle = 2πr

Solution :-

2 min 20 seconds = 140 seconds

Number of rounds = 140/4 = 35

⇒ Distance covered = 35 × circumference

⇒ Distance covered = 35 × 2 × 22/7 × 100

⇒ Distance covered = 5 × 2 × 22 × 100

⇒ Distance covered = 22000 m

Hence, the distance covered at the end of 2 min 20 seconds is 22000 m or 22 km.

And displacement is Zero as it return to initial position again.

Answer 2

Answer:

here radius =100

Distance covered=2*3.14*100=628m

After 2 min. 20 sec, he/she would have completed 3 and half round.

Therefore, displacement=

=200 m

Hope you got it.... ❣️