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[QUOTE="haruspex, post: 5467131, member: 334404"] I cannot tell since you have not posted your solution of the equations. The directions you choose for the variables at the start is immaterial. All you do there is choose which direction is positive for that variable. If it turns out that the accekeration is in that direction you will get a positive answer. If it is the other way you will get a negative answer. There are generally three approaches: - In the "naive" approach, you make a genuine guess at which way each object will accelerate and pick the positive directions accordingly; - in what one might call the Cartesian approach, you stick to a convention like up is positive and right is positive. But in general some accelerations could be at an angle, so you then have to break it into components. - Assign the positive directions at random. Or you could use a hybrid. Whichever you choose, the important thing is to be consistent through the equations. [/QUOTE]
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