neste caso http://www.physicsclassroom.com/class/momentum/u4l2b.cfm The law of conservation of momentum Momentum Conservation Principle - Physics Classroom physicsclassroom.com http://www.physicsclassroom.com/class/momentum/u4l2b.cfm the law of the conservation of momentum http://www.physicsclassroom.com/class/momentum/u4l2b.cfm The Physics Classroom: La ley de la conservación del impulso physicsclassroom.com The law of conservation of momentum physicsclassroom.com The law of conservation of momentum http://www.physicsclassroom.com/class/momentum/u4l2b.cfm