The Equation Describing the Position of an Object Undergoing Simple $x = ( 5.0 \mathrm {~cm} ) \cos ( 10 \pi t - \pi / 2 )$

Multiple Choice

The equation describing the position of an object undergoing simple harmonic motion is $x = ( 5.0 \mathrm {~cm} ) \cos ( 10 \pi t - \pi / 2 )$ , where t is in seconds. The period of the motion is

A) 0.2 s.
B) 0.1 s.
C) 5 s.
D) 20 s.