Answer
$2.4s$
Work Step by Step
We know that
$\frac{T}{4}=\frac{\pi}{2}\sqrt{\frac{L}{g}}$
We plug in the known values to obtain:
$\frac{T}{4}=\frac{\pi}{2}\sqrt{\frac{75ft}{9.81\frac{m}{s^2}}(\frac{0.305m}{ft})}$
$\frac{T}{4}=2.4s$
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