Question

A sparrow flies around a circular path at a constant speed. If the radius of the circular path is 15.0 m and the sparrow takes 10 seconds to complete one lap. how fast is the sparrow flying?

• A. 15 m/s
• B. 20 m/s
• C. 1.5 m/s
• D. 9 m/s
• E. 5 m/s

Answer 1

Answer: (D)

9 m/s

Radius of circular path $r=15$ m

Distance traveled in one lap $d=2\pi r=2\pi \times 15=94.2$ m

Time taken to complete one lap $t=10$ s

Thus speed of the sparrow $v=\frac{d}{t}=\frac{94.2}{10}=9.42$ m/s $\approx 9$ m/s