I thought it is less than its maximum but not zero, however the answer says wron

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I thought it is less than its maximum but not zero, however the answer says wrong. Can anyone tell me why?
A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous acceleration? A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous acceleration? At equilibrium, its instantaneous acceleration is zero. At equilibrium, its instantaneous acceleration is less than its maximum but not zero. Instantaneous acceleration cannot be determined without additional information. At equilibrium, its instantaneous acceleration is at maximum I thought it is less than its maximum but not zero, however the answer says wrong. Can anyone tell me why?
A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous acceleration? A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous acceleration? At equilibrium, its instantaneous acceleration is zero. At equilibrium, its instantaneous acceleration is less than its maximum but not zero. Instantaneous acceleration cannot be determined without additional information. At equilibrium, its instantaneous acceleration is at maximum A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous acceleration? At equilibrium, its instantaneous acceleration is zero. At equilibrium, its instantaneous acceleration is less than its maximum but not zero. Instantaneous acceleration cannot be determined without additional information. At equilibrium, its instantaneous acceleration is at maximum A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous acceleration? At equilibrium, its instantaneous acceleration is zero. At equilibrium, its instantaneous acceleration is less than its maximum but not zero. Instantaneous acceleration cannot be determined without additional information. At equilibrium, its instantaneous acceleration is at maximum A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its equilibrium position, what is its instantaneous acceleration? At equilibrium, its instantaneous acceleration is zero. At equilibrium, its instantaneous acceleration is less than its maximum but not zero. Instantaneous acceleration cannot be determined without additional information. At equilibrium, its instantaneous acceleration is at maximum At equilibrium, its instantaneous acceleration is zero. At equilibrium, its instantaneous acceleration is less than its maximum but not zero. Instantaneous acceleration cannot be determined without additional information. At equilibrium, its instantaneous acceleration is at maximum

Explanation / Answer

at equilibrium instantaneuous acceleration is 0 as force acting is zero

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