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The amplitude of oscillation of a simple pendulum is $A = 5$ cm and the period is $T = 2$ s. Find the maximum speed of the pendulum.
A mass of $m = 0.2$ kg suspended on a spring oscillates with frequency $f = 2$ Hz. Find the stiffness of the spring.
A spring pendulum has a mass $m = 0.5$ kg and a spring stiffness $k = 50$ N/m. Find the period of oscillation of this pendulum.
A simple pendulum has a length $l = 2.45$ m. Find its period of oscillation. The acceleration due to gravity is $g = 9.8$ m/s².