A Mass Vibrates Back and Forth from the Free End

Multiple Choice

A mass vibrates back and forth from the free end of an ideal spring (k = 20. N/m) with an amplitude of 0.25 m. What is the maximum kinetic energy of this vibrating mass?

A) 1.3 J
B) 2.5 J
C) 0.63 J
D) 5.0 J
E) It is impossible to give an answer since kinetic energy cannot be determined without knowing the object's mass.