<p>A particle of mass 10g&nbsp; moves in a straight line with retardation 2x, where x is the displacement in SI units. Its loss of kinetic energy for above displacement is&nbsp;<span class="equation">\(\begin{pmatrix}
\frac{10} {x}
\end{pmatrix}^{-n}\)</span>J. The value of n will be______​​​​​​​</p>