$47.$A small ferryboat is $4\mathrm{.}00$ m wide and $6\mathrm{.}00$ m long. When a loaded truck pulls onto it$,$ the boat sinks an additional $4\mathrm{.}70$ cm into the river. What is the weight of the truck?a$\mathrm{.}8\mathrm{.}687\mathrm{.}9$ Nb$\mathrm{.}886\mathrm{.}5$ Nc$\mathrm{.}11\mathrm{.}06$ N