5N of force is applied to move a large nail a distance of 10 cm from an electromagnet on a frictionless table. The nail is then released. What is the best description of the change from potential to kinetic energy as the nail moves back toward the electromagnet?
A) All of the energy is kinetic as soon as the nail is released.
B) The rate of change from potential to kinetic energy is constant.
C) The rate of change from potential to kinetic energy is exponential.
D) The kinetic energy is 25 J when the nail is 5 cm from the electromagnet.
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