Задача 40306.

The equation of oscillations is given in the form x = 5 cos 2.5pt cm. Find the displacement from the equilibrium position, the speed and acceleration of a point located at a distance of 20 m from the source of oscillations, for the moment t = 1 s after the start of oscillations. The speed of propagation of vibrations is 200 m/s.

Detailed solution with a brief record of the conditions, formulas and laws used in the solution, derivation of the calculation formula and answer.
If you have any questions regarding the solution, please write. I try to help.