Current Attempt in Progress Two rocks collide in outer space. Before the collision, one rock had mass 13 kg and velocity m/s. The other rock had mass 11 kg and velocity m/s. A 1 kg chunk of the first rock breaks off and sticks to the second rock. After the collision the 12 kg rock has velocity m/s. After the collision, what is the velocity of the other rock, whose mass is now 12 kg? U = i > m/s e Textbook and Media