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I agree that if
the spring scale is in a state of uniform motion relative to an inertial
reference frame, that looking at a snapshot picture and obtaining x, is
sufficient for determining the value of the spring force on the object its
attached to at that instant of time.
But that seems to me as tantamount to
saying I can use the spring scale to determine the force that the spring
scale exerts on an object. I have no arguement with that.
But that's not why I thought spring scales were brought into the
conversation in the first place. I thought they were brought into the
discussion for purposes of using them operationally to determine other
unknown forces without acceleration measurements.