Question

an athlete completes one round of a circular track of diameter 400 metre what is the displacement​

Answer 1

Answer:

You didn't explained the question well !!

You should write the particular time !!!

Explanation:

The displacement will be 0.

Becz the athelete completes the one round and comes back in its initial position.

And Plz mark me as the Branliest !!!

Answer 2

Correct Question :

An athlete completes one round of a circular track of diameter 200 m in 40 seconds. What will be the distance covered and displacement at the end of 2 minutes 20 seconds ?

Answer :

➳ Total Time = 2 minutes 20 seconds

= 2 × 60 seconds + 20 seconds

= 120 seconds + 20 seconds

= 140 seconds

Now,

In 40 s,the number of rounds completed = 1

So,

In 140 s,the number of rounds completed = $\sf{ \frac{1}{40} \times 140}$ = 3.5

Now the distance covered in 3.5 rounds,

The diameter of circular track is given to be 200 m,so the radius(r) of the circular track will be half of it,which is$\sf{ \frac{200}{2} = 100\:m}$

Now,

Distance covered in 1 round = Circumference of circular track

$\implies\sf{2 \pi r}$

$\implies \sf{2 \times\frac{22}{7} \times 100 \: m }$

$\implies \sf{628.57 \: m}\orange\bigstar$

Distance covered in 3.5 rounds

➳ 628.57 × 3.5 m

➳ 2200 m.

The displacement will be 200 m as it is equal to diameter of the circular track which is 200 m.