Resonance: an Object of Mass of 2

Multiple Choice

Resonance: An object of mass of 2.0 kg hangs from an ideal massless spring with a spring constant of 50 N/m. An oscillating force F = (4.8 N) cos[(3.0 rad/s) t] is applied to the object. What is the amplitude of the resulting oscillations? You can neglect damping.

A) 0.15 m
B) 0.30 m
C) 1.6 m
D) 2.4 m
E) 0.80 m