A Block of Mass M Slides Without Friction on a Table

Multiple Choice

A block of mass m slides without friction on a table with speed v. It hits and compresses a spring of force constant k by a distance l. The spring then expands again ejecting the block in the opposite direction as it was originally traveling. Neglecting the mass of the spring, what is the speed of the object after it is ejected by the spring?

A) v/2
B) 2v
C) v
D) 4v
E) v - l