Question

An athlete complete one round of a circular track of diameter 200m in 40sec. What will be the distance covered and displacement​

Answer 1

Distance =$1200\pi$

Displacement = 0 m

Explanation:

2 minutes = 120 sec

Speed = Circumference / Time $\sf [Circumference = 2\pi r$

$\sf= 2 x \pi x 200 / 40$

$\sf = 10\pi m/s$

i) Distance = Speed x Time

$\sf = 10\pi x 120$

$\sf = 1200\pi$

$\rm ≈ 3769.91 m$

ii) Displacement

At then end of 120 sec the athlete will be back at his starting point, completing 3 rounds

So,

Displacement = 0 m

Hope this helps! :)

Answer 2

Answer:

Displacement = 200m

Distance = 2200m

What is the rest of the ques...?

(guessing u r in 8th/ 7th)

Explanation:

r = 100m (since d= 200m)

time taken for one round is 40 sec

So, 2 min 20 sec = 140 sec

No. of rounds completed in 140sec = 140/40 = 3.5 rounds

Distance covered in 140 sec = 2πr x 3.5 = 2 x 22/7 x100 x 3.5

                                                 = 2200m

Displacement = 200m, since it starts and ends in the same postition.

Thank you, Hari Om!

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beii