Why is it important that the string connecting the masses be parallel with the

Why is it important that the string connecting the

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2.Why is it important that the string connecting the masses be parallel with the air track? 3.In 1589 Galileo dropped two different masses from the Leaning Tower of Pisa and observed their time of flights to be independent of mass. How does Galileo’s freefall experiment relate to the second experiment if there was no applied force? How does the addition of an applied force change things?
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