Physics assignment

A block of mass 0.2 kg can slide over a frictionless horizontal surface. It is attached to a spring whose stiffness constant is k = 20 N/m. The block is pulled 38 cm and let go. a) What is its maximum speed? m/s b) What is its speed when the extension is 13 cm? m/s c) At what position is the kinetic energy equal to the potential energy? cm

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