A block of mass $10 \,kg$ is released on rough incline plane. Block start descending with acceleration $2 \,m / s ^2$. Kinetic friction force acting on block is ..... $N$ (take $g=10 \,m / s ^2$ )
A$10$
B$30$
C$50$
D$50 \sqrt{3}$
Medium
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B$30$
b (b)
$a_{\text {down }}=2 m / s$
$a _{\text {down }}=g \sin 30-\mu g \cos 30$
$f =\mu mg \cos 30$
$2=\frac{ g }{2}-\frac{ f }{ m }$
$\frac{ f }{ m }=5-2 \quad=3$
$f =10 \times 3 \quad=30\,N$
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