A simple pendulum is $3\mathrm{.}20$ m long.

a$.$ What is the period of simple harmonic motion for this pendulum if it is located in an

elevator accelerating upward at $7\mathrm{.}25$ m$/$s$2?(2\mathrm{.}72$ s$)$

b$.$ What is its period if the elevator is accelerating downward at $7\mathrm{.}25$ m$/$s$2?(7\mathrm{.}07$ s$)$

c$.$ What is the period of simple harmonic motion for the pendulum if it is placed in a truck that

is accelerating horizontally at $7\mathrm{.}25$ m$/$s$2?$