(a) There are two vertical forces acting on the box, its weight and the restoring force of the spring. What law determines the relationship between these forces when the acceleration of the box is zero?

Newton's first law

Explanation:

-An object will remain at or in uniform motion in a straight line unless acted upon by an external force.

-The acceleration of the box is equal to zero, so the net force on the box should be zero, so:

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