Задача id308

The wave travels in a straight line at a speed of 20 m/s. Two points located on this straight line at a distance of 12 and 15 m from the source of vibrations oscillate according to the sine law with amplitudes equal to 0.1 m and with a phase difference of 135°. Find the wavelength, write its equation and find the displacement of the indicated points at time t = 1.2 s.

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