A 750g mass is placed on a spring which lies on a frictionless surface. The spring has a spring constant k=500 N/m and is at its equilibrium length.
(a) The spring is stretched so that it is 10.0 cm longer than its equilibrium length. How much elastic potential energy is stored in the spring now?
(b) Now the spring from part (a) is released. What is the speed of the mass as it passes through the equilibrium point (x=0)?
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