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
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