Which of the following correctly represents the conservation of mechanical energy in a frictionless system? Also refer to the given circuit setup:

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1. Which of the following correctly represents the conservation of mechanical energy in a frictionless system? Also refer to the given circuit setup:

1. Kinetic energy increases while potential energy decreases equally2. Total mechanical energy remains constant3. Kinetic energy remains constant4. Potential energy is always zero

Which of the following correctly represents the conservation of mechanical energy in a frictionless system? Also refer to the given circuit setup: