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 : $(g = 10\, ms^{-2})$
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$\mathrm{v}= \mathrm{g}(\sin \theta-\mu \cos \theta) \mathrm{t} $
$=10\left[\frac{1}{2}-(0.2) \frac{\sqrt{3}}{2}\right] 5=16.34 \mathrm{ms}^{-1} $
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