MomentumThe momentum of a particle is defined as the product of its mass times its velocity. It is a vector quantity. The momentum of a system is the vector sum of the momenta of the objects which make up the system. If the system is an isolated system, then the momentum of the system is a constant of the motion and subject to the principle of conservation of momentum. The basic definition of momentum applies even at relativistic velocities but then the mass is taken to be the relativistic mass. The most common symbol for momentum is p. The SI unit for momentum is kg m/s. You may insert numbers for any of the quantities. Then click on the text or symbol in the formula above for the quantity you wish to calculate.The numbers will not be forced to be consistent until you click on the desired quantity. 
Index Conservation of momentum  

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