A 3.0-kg mass moving in the positive x direction with a speed of 10 m/s collides with a 6.0-kg mass initially at rest. After the collision, the speed of the 3.0-kg mass is 8.0 m/s, and its velocity vector makes an angle of 35° with the positive x axis. What is the magnitude of the velocity of the 6.0-kg mass after the collision?
◦ 2.2 m/s
◦ 2.9 m/s
◦ 4.2 m/s
◦ 3.5 m/s
◦ 4.7 m/s