A 300-g mass hangs at the end of a string. A second string hangs from the bottom

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A 300-g mass hangs at the end of a string. A second string hangs from the bottom of that mass and supports a 900-g mass. 

(a) Find the tension in each string when the masses are accelerating upward at 0.700 m/s2. Don’t forget gravity. 

(b) Find the tension in each string when the acceleration is 0.700 m/s2 downward.

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