Change in Momentum: Particle Moves Diametrically Opposite

sphyics
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what will be the change in momentum if a particle moves from one point to its diametrically opposite.
 
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Got any specifics for this? What kind of answer are you looking for exactly?
 
I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
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