Haven't got time for conservation

Consider a system of NN particles whose coordinates are r={rix,riy,riz}\mathbf{r} = \{r_i^x, r_i^y, r_i^z\}, and whose velocities are {r˙i}\{\dot{\mathbf{r}}_i\}.

Each pair of particles (i,j)\left(i, j\right) interacts through a potential V(ri,rj)V\left(\mathbf{r}_i, \mathbf{r}_j\right) which has no direct dependence on time. As the system evolves in time, which of the following bulk quantities must be conserved?

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