aceeleration of the ring

1. The problem statement, all variables and given/known data

A ring is moving on a vertical rod attached to a spring. Find the velocity of the ring when spring becomes horizontal. The spring is ideal with spring constant 400N/m. Mass of ring is 10kg. Natural length of spring is 4m. Initially the ring is at rest as shown in figure.(attachment)

2. Relevant equations

3. The attempt at a solution
I want to solve the problem using Newtons laws and not by conservation of energy method. I have no idea on where should I start. I have made the following equation:

Fcosθ + mg = ma ……..where F is the force by the spring
…….. θ is the angle between spring and rod
…….. a is the acceleration of the ring

Attached Images
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