Solve the Problem $\mathrm { s } ( \mathrm { t } ) = - 4 \cos 7 \pi \mathrm { t }$

Solve the problem.
-The position of a weight attached to a spring is $\mathrm { s } ( \mathrm { t } ) = - 4 \cos 7 \pi \mathrm { t }$ inches after $t$ seconds. When does the weight first reach its maximum height?

A) After $\frac { 7 } { \pi } \mathrm { sec }$
B) After $\frac { \pi } { 7 } \mathrm { sec }$
C) After $\frac { 7 } { 4 } \mathrm { sec }$
D) After $\frac { 1 } { 7 } \mathrm { sec }$

Correct Answer:

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