A 30-Kg Mass Moving in the Positive X Direction with a a Speed

Multiple Choice

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?

A) 2.2 m/s
B) 2.9 m/s
C) 4.2 m/s
D) 3.5 m/s
E) 4.7 m/s