Question

A body covers 10 revolutions in a 2m radius circle it travels
123.6m , 20m, 12.5m,none​

Answer 1

We have,

Number of revolutions = 10

Radius of the circular path = 2 m {r}

We know,

Circumference (one revolution) = 2πr

∴ 10 revolutions = 2πr × 10 = 20πr

⇒ Distance travelled = 20 × 3.14 × 2 = 40 × 3.14 m

⇒ Distance travelled = 31.4 × 4 m

⇒ Distance travelled = 125.6 m (approx.)

∴ D) None is the correct answer.