The Position of a Mass That Is Oscillating on a Spring

Multiple Choice

The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26s^-1) t]. What is the acceleration of the mass when t = 0.825 s?

A) 9.89 cm/s²
B) -9.89 cm/s²
C) 10.6 cm/s²
D) -10.6 cm/s²
E) 0 cm/s²