A small ball of mass
m is hang by a string of length
l and attached to a spring of stiffness
k like shown below.

The spring can move freely in vertical direction, but its orientation is always horizontal. The ball is in equilibrium when it forms an angle
θ with horizontal.
Determine period of oscillation,
T, if the ball move slightly on xy-plane!
Gravity acceleration
g.
got this question as well i solved it by restoring torque method.and i solved it for small oscillations .
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