A Block of Mass M = 9

Multiple Choice

A block of mass m = 9.0 kg and speed V and is behind a block of mass M = 27 kg and speed of 0.50 m/s, as shown int the figure. The surface is frictionless, and the blocks suddenly collide and
Couple. After the collision, the blocks have a common speed of 0.90 m/s. How much kinetic energy
Of the blocks is lost due to the collision?

A) 31 J
B) 2.0 J
C) 8.6 J
D) 4.6 J
E) 11 J