A simple pendulum is $5\mathrm{.}00$ m long. What is the period of small oscillations for this pendulum if it is located in an elevator

$($a$)$

accelerating upward at $5\mathrm{.}00$m$/$s$2?$

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$($b$)$

Accelerating downward at $5\mathrm{.}00$m$/$s$2?$

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$($c$)$

What is the period of this pendulum if it is placed in a truck that is accelerating horizontally at $5\mathrm{.}00$m$/$s$2?$