A block of mass 3.40 kg is placed against a horizontal spring of constant k = 855 N/m and pushed so the spring compresses by 0.0550 m. What is the elastic potential energy of the block-spring system (in J)? J=? If the block is now released and the surface is frictionless, calculate the block's speed (in m/s) after leaving the spring. m/s=?
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