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I still don't understand why delta v is equal to the +/- number attached to the velocity when the velocity is given. It seems like it should be twice the value of the number that is +/-, but my TA told be explicitly that it is not.
Moment or p (not actually p but looks like it!) is a product of mass and velocity. Its possible to encounter a question where this might be asked for. However, from what I have seen the velocity part is more important. That's also what leads to momentum uncertainty.
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