Question

A cyclist moving on a circular track of radius 40 m completes half a revolution in 40 sec. Its average velocity is

• A. zero
• B. 2 $m{s}^{-1}$
• C. 4 $\pi m{s}^{-1}$
• D. 8 $\pi m{s}^{-1}$

Answer 1

The correct option is B 2 $m{s}^{-1}$

Displacement is 2R.

Time is 40 sec.

Average velocity $=\frac{2R}{40}=\frac{2\times 40}{40}$

$v_{av}=2m/s$.