An athlete completes one round of a circular track of radius 10 m in 40 s. The distance covered by him in 2 minutes 20 seconds is

Question

An athlete completes one round of a circular track of radius 10 m in 40 s. The distance covered by him in 2 minutes 20 seconds is (A) 400 m (B) 220 m (C) 132 m (D) 66 m

Tardigrade Admin · Accepted Answer

upsilon = (2π r/t) = 2 × (22/7) × (10/40) = (11/7) m s-1 Distance, S = upsilon t = (11/7) × 140 = 220 m

Q. An athlete completes one round of a circular track of radius $10 m$ in $40 s$ . The distance covered by him in $2$ minutes $20$ seconds is

400 m

220 m

132 m

66 m

$υ = \frac{2 π r}{t}$
$= 2 \times \frac{22}{7} \times \frac{10}{40}$
$= \frac{11}{7} m s^{- 1}$
Distance, $S = υ t$
$= \frac{11}{7} \times 140$
$= 220 m$

Q. An athlete completes one round of a circular track of radius 10m in 40s. The distance covered by him in 2 minutes 20 seconds is