Two identical objects,one moving twice as fast as the other,collide with each other in the following

题目

Two identical objects,one moving twice as fast as the other,collide with each other in the following way:
0--------> 2v v

答案

they will be moving to the right.because before the collision the vector sum of their momentum was to the right,and the momentum wouldn't have a loss in the collision.Applying the momentum conservatio...