BRAINLIEST True or False. Two waves will overlap exactly (i. e., match up) only when the phase of one of the waves is exactly 2pi radians greater or less than the phase of the other wave

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •