For a mass oscillating on a spring, is the velocity of the mass constant

Same question as the title. Is the velocity of the mass constant on an oscillating scale? How do you know?

Thanks.

No. Otherwise you'd be able to cut the spring while it is in the middle of its behavior, and it would still continue in that same behavior.

There isn't a single kinematics quantity that is constant during this motion type. Unless you define an entirely new set of kinematics quantities specifically made for vibrations. Quantities like amplitude, frequency, and period.

Maximum velocity occurs at the equilibrium position.

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the velocity is not constant, it varies sinusoidally as the block exchanges kinetic energy and potential energy during its oscillation

I am not sure what you mean by an oscillating scale so cannot address that question.