A block of mass $1 \,kg$ is projected from the lowest point up along the inclined plane. If $g=10 \,ms ^{-2}$, the retardation experienced by the block is ............. $ms ^ {-2}$
A$\frac{15}{\sqrt{2}}$
B$\frac{5}{\sqrt{2}}$
C$\frac{10}{\sqrt{2}}$
D
Zero
Medium
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A$\frac{15}{\sqrt{2}}$
a (a)
Retarding forces will be friction and gravitational force
$a=-\left(g \sin 45^{\circ}+\mu g \cos 45^{\circ}\right)$
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