Block A (mass =5 kg ) with an initial velocity of 10 m/s right, collides with block B (mass =10 kg ) which is at rest. The final velocity of B is 6 m/s right. What is the final velocity (magnitude and direction) of A? The surface is frictionless.
A. 4 m/s right
B. 0
C. 2 m/s left
D. 4 m/s left
E. 2 m/s right