A block takes twice as much time to slide down P a \( 45^{\circ} \)...

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A block takes twice as much time to slide down
P a \( 45^{\circ} \) rough inclined plane as it takes to slide down a similar smooth plane. The coefficient of friction is:
(1) \( \frac{3}{4} \)
(2) \( \frac{\sqrt{3}}{2} \)
(3) \( \frac{1}{4} \)
(4) \( \frac{1}{3} \)
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