In the diagram representing the position of an object in simple harmonic motion, what phase shift should be applied to the black curve in order tomatch the blue curve? A. pi/2   B. pi   C. 3 pi/2   D. 2pi   E. zero

In the diagram representing the position of an object in simple harmonic motion, what phase shift should be applied to the black curve in order tomatch the blue curve?

A. pi/2   B. pi   C. 3 pi/2   D. 2pi   E. zero