A mass m attached to spring of natural length `l_0` and spring constant k. One end of string is attached to centre of disc in horizontal plane which is being rotated by constant angular speed `omega`. Find extension per unit length in spring (given `k gtgt m omega^2` ) :
A. `(momega^(2))/(2k)`
B. `(2momega^(2))/(k)`
C. `(momega^(2))/(k)`
D. `sqrt((2)/(3))((momega^(2))/(k))`
