A 50-Kg Mass with an Initial Velocity of 4

Multiple Choice

A 5.0-kg mass with an initial velocity of 4.0 m/s, east collides with a 4.0-kg mass with an initial velocity of 3.0 m/s, west. After the collision the 5.0-kg mass has a velocity of 1.2 m/s, south. What is the magnitude of the velocity of the 4.0-kg mass after the collision?

A) 2.0 m/s
B) 1.5 m/s
C) 1.0 m/s
D) 2.5 m/s
E) 3.0 m/s