- #1

#### pmb

I put it here

www.geocities.com/physics_world/sr/momentum_conservation.htm

In that page three relations are derived. For a conservative system

(1) The total angular momentum is conserved

(2) The total linear momentum is conserved

(3) The "center of mass/energy vector" R is related to P, the total momentum of a conservative system, by P = M(dR/dt) = MV where M = "Total (relativistic) mass = "total energy"/c^2

Also "center of mass vector" = "center of energy vector"

Pete