A $3\mathrm{.}50$ kg block is pulled along a moving conveyor belt at a constant speed of $0\mathrm{.}500$ m$/$s relative to a stationary observer while the belt moves at a constant speed of $0\mathrm{.}200$ m$/$s in the same direction. If the coefficient of kinetic friction is $0\mathrm{.}400,$ the magnitude of the mechanical energy dissipated, in J$,$ caused by the force of friction on the block in $8\mathrm{.}00$ s is