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- The masses must be accelerating at the same rate
- but in opposite directions. Since is heavier, assume
- that it is moving toward the ground. Note that the negative
- in equations (1) indicates that the forces are acting in
- opposite directions and therefore accounts for the negative
- normally associated with the acceleration due to gravity.
- Setting both equations equal to T and then substituting yields
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- (2) Find the tension in the string.
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- Substituting into either of equations (1) yields T = 140N (this value is a magnitude - direction depends on which mass is being considered).
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