A string oscillates according to the equation below. y' = (0.50 cm) sin[(π/3 cm-1)x] cos[(45π s-1)t] (a) What are the amplitude and speed of the two waves (identical except for direction of travel) whose superposition gives this oscillation? cm (amplitude) cm/s (speed) (b) What is the distance between nodes? cm (c) What is the speed of a particle of the string at the position x = 1.5 cm when t = 9/8 s? cm/s i have no clue how to do this problem. any help is greatly appreciated. thanks?