The following equation describes the periodic motion of a particle, for which the unit of h is in meters and the unit of t is in minutes. Solve for the amplitude, the frequency, and the period.
h = - 8 cos [(π/4)t]

• A. amplitude = - 8 meters; period = 1/2 minutes; frequency = 2 cycles per minute
• B. amplitude = 8 meters; period = 2 minutes; frequency = 1/2 cycles per minute
• C. amplitude = - 8 meters; period = 1/8 minutes; frequency = 8 cycles per minute
• D. amplitude = 8 meters; period = 8 minutes; frequency = 1/8 cycles per minute

Answer: (D)