Question

an athelet completes one round of circular track of radius of 21m in 20sec find the speed of an athelet​

Answer 1

◈ Given :-

• Radius of Circular track = 21m

• Time taken (t) = 20 seconds

◈ To Find :-

• Speed of an Athlete

◈ Solution :-

We know that,

✑ Circumference of Circle = 2πr

And,

According to Question :-

✑ Distance travelled by Athlete = Circumference of Circle

So,

➟ Distance travelled = 2πr

➟ Distance = 2 × 22/7 × 21 = 132m

Hence,

➟ Distance travelled by Athlete = 132m

Now,

We know that,

✑ Speed = Distance travelled / Time taken

So,

✏ Speed of an Athlete = 132/20 = 66/10 = 6.6 m/s

Answer 2

Given

$\bold{Radius \ of \ the \ circular \ track} = 21 \ m$

$\bold{Time \ taken \ by \ the \ athlete \ to \ complete \ one \ round} = 20 \ seconds$

To Find

$\bold{Speed \ of \ the \ athelete} = ?$

SOMETHING YOU NEED TO KNOW

$\bold {Speed = \dfrac{Distance}{Time} }$

Distance = Circumference of the circle

$\implies 2\pi r$

$\implies 2 * \dfrac{22}{7} * 21$

$\implies 2 * 22 * 3$

$\implies \underline{\underline{ 132 \ m}}$

$\implies \bold{Speed} = \dfrac{132}{20}$

$\implies \dfrac{66}{10}$

$= 6.6 \ m/s$

$\boxed{\boxed{\bold{Therefore, \ the \ speed \ of \ the \ athlete \ is \ 6.6 \ m/s}}}$