70. The material point of mass m = 10 g oscillates with an amplitude A = 40 cm and a period T = 4. At the initial time t0 = 0 x0 displacement reaches the maximum possible value. Write down the equation of oscillations points and determine the kinetic, potential and total energy of a point in time t = 3 s.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)