Question : An object is moving in a circle of radius 100 m with a constant speed of 31.4 ms−1. What is its average speed for one complete revolution?
(A) zero
(B) 31.4ms^{-1}
(C) 3.14ms^{-1}
(D) \sqrt{2}\times 31.4ms^{-1}
Answer : option (B)
Solution :
