일반물리학 1 — Oscillations: Problem 25

25 Two particles oscillate in simple harmonic motion along a common straight-line segment of length A. Each particle has a period of 1.5 s, but they differ in phase by π/6 rad. (a) How far apart are they (in terms of A) 0.60 s after the lagging particle leaves one end of the path? (b) Are they then moving in the same direction, toward each other, or away from each other?