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?