A dust particle has an excess change of$4\mathrm{.}0\backslash$x$10^6$electrons and a mass of$4\mathrm{.}0\backslash$x$10^8$g$.$It is initially held at d$=1\mathrm{.}0$x$10^3$m directly above a fixed object of the same size that is charged with the same number of electrons. Both objects are in an evacuated container. Determine the initial force exerted on the dust particle by the fixed charge. The initial force exerted on the dust particle by the fixed charge is Fiq$=3\mathrm{.}7$x$10^-9$ N$.$ The maximum height of the dust particle after its release measured from its initial position is h$=8\mathrm{.}4$x$10^-3$ m

Determine the initial acceleration of the dust particle