Final answer:
At the equilibrium position during simple harmonic motion, the object has minimum potential energy and maximum kinetic energy.
Step-by-step explanation:
When an object undergoes simple harmonic motion (SHM) and momentarily passes through the equilibrium position, its potential energy (U) is at a minimum, while its kinetic energy (K) is at a maximum. This is because, at the equilibrium position, no elastic potential energy is stored in the spring (U = 0), and the object's velocity—and therefore its kinetic energy—reaches its maximum value. In the cycle of energy conversion for a simple harmonic oscillator, all the energy oscillates between potential and kinetic forms, with the total energy remaining constant.