A block is given certain upward velocity along the incline \( \math...

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A block is given certain upward velocity along the incline
\( \mathrm{P} \) of elevation \( \alpha \). The time of ascent to upper point was found to be half the time of descent to initial point. The co-efficient of
W friction between block and incline is :
(A) \( 0.5 \tan \alpha \)
(B) \( 0.3 \tan \alpha \)
(C) \( 0.6 \tan \alpha \)
(D) \( 0.2 \tan \alpha \)
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