A 10-Kg Box Is at Rest at the End of an Unstretched

Multiple Choice

A 10-kg box is at rest at the end of an unstretched spring with constant k = 4000 N/m.The mass is struck with a hammer giving it a velocity of 6.0 m/s to the right across a frictionless surface.What is the amplitude of the resulting oscillation of this system?

A) 0.3 m
B) 0.4 m
C) 0.5 m
D) 0.6 m
E) 2 m