Three balls of the same mass form a closed system of bodies. Two balls move towards each other with equal speeds in absolute value. The third ball is motionless. What is the momentum of a given system of bodies?
According to the rule of addition of vectors directed along one line, but in opposite directions, the sum of impulses of cars moving towards each other is equal to zero. The third ball is at rest. Therefore, the sum of the impulses of this closed-loop system is zero.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.