A harmonic wave moving in the positive x direction. Given the amplitude A=0.1 m, period T=0.5 s, wavelength λ=10 m. The original point and the source of the wave coincide. The displacement of the wave source is positive maximum at t=0. (1) Find the wave function. (2) What is the displacement of the point x= λ /4 at t1=T/4? (3) What is the vibration speed of the point x= λ /4 at t2=T/2?
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