Two Identical Undamped Oscillators Have the Same Amplitude of Oscillation

Multiple Choice

Two identical undamped oscillators have the same amplitude of oscillation only if:

A) they are started with the same displacement x₀
B) they are started with the same velocity v₀
C) they are started with the same phase
D) they are started so the combination ω² x₀²+v₀² is the same
E) they are started so the combination x₀²+ω² v₀² is the same