On one end of the swing at a length l1 from the swing’s rotation axis there is a mass m1. On the other end of the swing, which is l2 away from the rotation axis, falls a mass m2 from a height h. The collision is completely inelastic and the swing is horizontal at the moment of collision. The swing’s mass is very small and it does not have to be taken into account. How fast does the first mass move right after the collision?