A body is executing simple harmonic motion with an angular frequency s rad/2 . The velocity of the body at 20 mm displacement, when the amplitude of motion is 60 mm , is

Options

A. 40 mm/s
B. 60 mm/s
C. 113 mm/s
D. 120 mm/s

Answer

C

Explanation

`V = omega sqrt(A^(2) - y^(2)) rArr 2 sqrt(60^(2) - 20^(2)) rArr 2 xx sqrt(3200) = 113`