Determine the Equation of the Graph $\mathrm { s } ( \mathrm { t } ) = - 3 \cos 5 \pi \mathrm { t }$

Multiple Choice

Determine the equation of the graph.
-The position of a weight attached to a spring is $\mathrm { s } ( \mathrm { t } ) = - 3 \cos 5 \pi \mathrm { t }$ inches after $\mathrm { t }$ seconds. When does the weight first reach its maximum height?

A) After $\frac { 1 } { 5 } \mathrm { sec }$
B) After $\frac { 5 } { \pi } \sec$
C) After $\frac { \pi } { 5 } \sec$
D) After $\frac { 5 } { 4 } \mathrm { sec }$