50. The potential energy of a spring is 0.3 J when it is compressed 0.04 m to the left of its equilibrium
point it comes to its lefomost position. What is its kinetic energy when it returns to the equilibrium point
A. 0.25 J and moving to the right
B. zero
C.-0.25 J and moving to the left
D. 0.25 J and at rest.
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