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Homework Statement:
 Problem 24 in US Physics Olympiad FMA packet A
Relevant Equations:
 F=ma
Because this problem is easier to understand with a picture, I'll just copy paste the original problem. There is no question about the validity of the solution. My question is about the statement in the solution
"Consider the instant when the mass is moving vertically upward. In this instant the mass’s acceleration is perfectly horizontal, which means that the vertical component of the force from the spring must be equal and opposite to the force of gravity."
I know in fact this is a correct statement, however, is there a simple logical argument to support this statement.
"Consider the instant when the mass is moving vertically upward. In this instant the mass’s acceleration is perfectly horizontal, which means that the vertical component of the force from the spring must be equal and opposite to the force of gravity."
I know in fact this is a correct statement, however, is there a simple logical argument to support this statement.
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