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Problem 40306.

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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.
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