일반물리학 1 — Rotation: Problem 56

56 Figure 10-37 shows particles 1 and 2, each of mass m, fixed to the ends of a rigid massless rod of length L1 + L2, with L1 = 20 cm and L2 = 80 cm. The rod is held horizontally on the fulcrum and then released. What are the magnitudes of the initial accelerations of (a) particle 1 and (b) particle 2?