A 0.75 kg wood block is pushed 0.2 m into a horizontal spring with a spring constant of 50 N/m and released. a. How much spring potential energy is in the system before the wood block begins to move? b. If the surface is frictionless, what is the kinetic energy of the block as it leaves the spring? c. If the surface is frictionless, what is the velocity of the block as it leaves the spring? d. Assuming the surface is not frictionless, and the wood block leaves the spring at a velocity of 1.32 m/s. How much energy is lost due to friction?