A particle moves in a circular path, 0.4 m in radius, with constant speed. If particle makes 5 revolutions in each second of its motion, the speed of the particle is
(A) 10.6 m/*
(B) 11.2 m/*
(C) 12.6 m/*
(D) 13.6 m/*
The correct option -**(C) 12.6 m/s**
Explanation:-
Using, v = rω
= r x (2πn) = 0.4 x 2π x 5
= 0.4 x 2 x 3.14 x 5 = 12.56 ≈ 12.6 m/s
