Question

A man running on a circular track of radius$=20\text{m}$, Find the linear distance travelled by the man when he completes $5$ revolutions?

• A. $628.4\text{m}$
• B. $314.2\text{m}$
• C. $157.1\text{m}$
• D. $125.71\text{m}$

Answer 1

The correct option is A $628.4\text{m}$

We know that,
linear distance travelled in one revolutiuon= Circumference of the circle= 2$\pi r$
for 5 revolutions $=5\left(2\pi r\right)$
$=5\left(2\pi \right)\left(20\right)$
$=628.4\text{m}$
$(\pi =3.14)$