Linear Momentum of One or Many Particles Momentum is denoted with the symbol p and is equal to the product of mass and velocity, where both velocity and momentum are vectors. The SI units for this value is kilogram meters per second. p=mv (kg*m/s) If there is a system of particles, the momentum of the system is equal to the addition of all individual momenta of each particle. p=p1+p2+...+pn                                    or                                 p=m1v1+m2v2+...+mnvn Where p1 and p2 are the momentum of two different particles and m1, m2, v1, and v2 are the masses and velocities of two different particles.

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