An object is moving in a circle of radius 100 m with a constant speed of 31.4  $m{s}^{-1}$. What is its average
speed for one complete revolution? 

• A

  Zero

• B

  31.4 $m{s}^{-1}$

• C

   3.14 $m{s}^{-1}$

• D

  $\sqrt{2}$ x 31.4 $m{s}^{-1}$