2. A simple pendulum consists of a mass m suspended from a fixed point by a weight- less, extensionless rod of length 2. Obtain the equation of motion and, in the approximation that sin 0 = 0, show that the natural frequency is wo = Vg/l, where g is the gravitational field strength. Discuss the motion in the event that the motion takes place in a viscous medium with retarding force 2m V gl 0