A block of wood resting on an inclined plane of angle $30^o$, just starts moving down. If the coefficient of friction is $0.2$, its velocity (in $ms^{-1}$) after $5\, seconds$ is : $(g = 10\, ms^{-2})$
A$12.75$
B$16.34$
C$18.25$
D$20$
Medium
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B$16.34$
b $\mathrm{v}= \mathrm{g}(\sin \theta-\mu \cos \theta) \mathrm{t} $
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