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Mechanical Engineering Math help.

I am confused about how to work this problem can anyone take a crack at it? My work is shown in a post below.

Thanks for any and all help!

If the spring is released from rest in the position shown in the picture , the spring contracts pulling the mass to the right. Find the Velocity of the mass when the string and the spring are parallel.

Mass = 1 kg

Spring Constant = K= 800 N/m

Unstretched length of Spring= 1m

Find same answer by using both methods

A) Principle of work and energy

B) Conservation of Energy