A 400 Kg Object Is Moving at 3

Multiple Choice

A 4.00 kg object is moving at 3.00 m/s WEST. It catches up to and strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects undergo an elastic collision in the EAST-WEST direction. The velocity of the 4.00 kg object after the collision is

A) 1.00 m/s WEST.
B) 2.80 m/s EAST.
C) 1.80 m/s WEST.
D) 2.80 m/s WEST.
E) 1.80 m/s EAST.