Solve the Problem $\frac { 1 } { 3 }$ Second, Determine a Trigonometric Model That Gives the Position of Pulled

Multiple Choice

Solve the problem.
-A weight attached to a spring is pulled down 4 inches below the equilibrium position. Assuming that the period of the system is $\frac { 1 } { 3 }$ second, determine a trigonometric model that gives the position of the weight at time $t$ seconds.

A) $y = - 4 \cos 6 \pi t$
B) $y = - 4 \cos 3 \pi t$
C) $y = 4 \cos \frac { 1 } { 3 } t$
D) $y = 4 \cos 6 \pi t$