A ring of mass m can slide over a smooth vertical rod. The ring is connected to a spring of force
constant k = 
where 2R is the natural length of the spring. The other end of the spring is fixed to the ground at a horizontal distance 2R from the base of the rod. The mass is released at a height of 1.5R from ground:
A
Calculate the work done by the spring.
B
Calculate the velocity of the ring as it reaches the ground 
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