Which of these statements for simple harmonic oscillations is true? a. The instant speed and acceleration of an oscillating object is the largest when it is going through the equilibrium point. b. The instant speed of an oscillating object is the largest when it is the furthest from equilibrium. c. The instant acceleration of an oscillating object is the largest when it is the furthest from equilibrium. A model based on a harmonic oscillator describing human walking and balance ('9 a. can be represented with the sinusoidal trajectory of the center of mass of a subject. O b. can be represented with the linear trajectory of the center of mass of a subject. O c. can be represented with the trajectory of unclear shape. F D d. can be represented with the interrupted trajectory of the center of mass of a subject. Which sound has a higher pitch? (A) (B) (C) (D)