We have two girls, with mass (M). They become close to each other in speed of V. The distance between them is 3L.
I was asked to calclute the Angular velocity (w) of the two girls. So I set the rotation axis in the middle (where the distance between the two girls and the axis is 1.5L, and I calcute the Angular velocity by the formula of w=v\r, where r=1.5L, and I got that w=2v/3L.
As I understood, the answer is correct, but this is not the correct way. What is my mistake? (sorry about my english)