Compute all parts of following question given below:
Question: Adjacent antinodes of a standing wave on a string are 15.0 cm apart. A particle at an antinodes oscillates in SHM with amplitude 0.850 cm and period 0.0750 s. The string lies along the +x axis and is fixed at x = 0.
Part A: Find the displacement of a point on the string as a function of position and time.
Part B: Find the speed of propagation of a transverse wave in the string.
Part C: Find the amplitude at a point 3.0 cm to the right of antinodes.
I know the correct answer for above questions but explain how to get this answer! Thanks.