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A massless spring is lying on a frictionless horizontal table. It has a spring constant of...

A massless spring is lying on a frictionless horizontal table. It has a spring constant of 800 N/m with an unstretched length of 23 cm and a 3 kg block is attached to its free end. You stretch the spring to a length of 33 cm and release it from rest.

a) How fast is the block moving when the length of the spring is 28 cm? (Use ? = ?2 − ?1.)

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