Given that a $1200$ kg car pulls a boat and trailer find the following $($take g $=10$ m$/$s$2)$ : a$).$ What total force resists the motion of the car, boat and trailer, if the car exerts an $1850$ N force on the road and produces an acceleration of $0\mathrm{.}750$ m$/$s$2?$ The mass of the boat plus trailer is $975$ kg$.$ b$)$ What is the force in the hitch between the car and trailer if $70\%$ of the resisting forces are experienced by boat and trailer $?$