D. The velocity decreases, the acceleration increases, and the net force increases.
Equilibrium is he condition of a system when neither its state of motion nor its internal energy state tends to change with time.
or an equilibrium position is referred to the position where no net force is acting on the body.
In the equilibrium position if you keep the same mass but change the spring, this means that the equilibrium position of a horizontal spring is independent of the mass attached to it.
The same reasoning applies if you, for example, change the spring for a stiffer one but with the same natural length: the equilibrium position will be unaffected.
At the equilibrium position, where the velocity is greatest, the acceleration equals zero, and the force on the mass-spring is mg, the same as when the mass-spring was not oscillating.
As a mass on a spring moves farther from the equilibrium position,
The velocity decreases, the acceleration increases, and the net force increases.
Learn more about equilibrium position here:https://brainly.com/question/10374921
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