Choose the One Alternative That Best Completes the Statement or Answers

Essay

Choose the one alternative that best completes the statement or answers the question.
-The distance d (in meters) of the bob of a pendulum from its rest position at time t (in seconds) is given by: $$d = - 9 e ^ { - 0.6 t / 60 } \cos \left( \sqrt { \left( \frac { 2 \pi } { 7 } \right) ^ { 2 } - \frac { 0.36 } { 3600 } } t \right)$$ What is the maximum displacement of the bob after the first oscillation?
A) about 8.39 m
B) about 5.18 m
C) about 0.13 m
D) about 8.91 m