Work, Energy and Power: JEE Main 2023 Physics question

A particle of mass $10 \mathrm{~g}$ moves in a straight line with retardation $2 x$, where $x$ is the displacement in SI units. Its loss of kinetic energy for above displacement is $\left(\frac{10}{x}\right)^{-n}$ J. The value of $\mathrm{n}$ will be __________