In the Figure Showing an Isolated System, Determine the Character

Multiple Choice

In the figure showing an isolated system, determine the character of the collision. The masses of the blocks, and the velocities before and after, are shown. The collision is

A) partially inelastic.
B) completely inelastic.
C) perfectly elastic.
D) characterized by an increase in kinetic energy.
E) not possible because momentum is not conserved.