[填空题]
After a completely inel3q *ie6fz3;6s bt 1uqolu4g efast-vad (fpd0ztdt0sufjj ))z :2ic collision between two objects of equal mass, each having initiatj )t0- vju(s2z:)p f0fdddzal speed the two move off together with speed v/3 What was the angle between their initial directions? $^{\circ} $
