1. Assume 2 particles
L = .5m1(x1^2+y1^2+z1^2)+.5m2(x2^2+y2^2+z2^2)-V(x1-x2)
a. Define momentum and show that it's conserved
b. Show that Newton's Third Law holds
2. Find the equation to represent the difference in ages of the two twins in the twin paradox.
3.V,U in x direction. Galilean addition Vt=V+U. Using Lorentz Transforms prove Vvel=(V+U)/(1+(UV/C2)
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