In outer space, far from other objects, two rocks collide and stick together. Before the collision their momenta were kg.m/s and kg.m/s. Part 1 (a) What was their total momentum before the collision? (Express your answer in vector form.) i > kg.m/s Save for Later Attempts: 0 of 4 used Submit Answer Part 2 (b) What must be the momentum of the combined object after the collision? (Express your answer in vector form.) i i > kg.m/s eTextbook and Media Save for Later Attempts: 0 of 4 used Submit