A particle of mass \( 10 \, \text{g} \) 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 \( \left( \dfrac{10}{x} \right)^{-n} \, \text{J} \). The value of \( n \) will be _________.
