a 2.00 kg block is attached to a spring of force constant 500 N/m. The block is pulled 5.00 cm to the right of equilibrium and released from rest. Find the speed of the block as it passes through equilibrium if a) the horizontal surface is frictionless and b) the coefficient of friction between block and surface is 0.350.
Energy stored in spring= 1/2 mv^2 if no friction
Energy stored in spring= 1/2 mv^2 - mg*mu*.05 if friction
I don't understand how to find the velocity....
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