A wind force of $4(1+0\mathrm{.}01)kN$ acts on the main sail of a boat at a height of $2\mathrm{.}5$ m above the

level of centre of mass C of the boat $($Figure $3).$ The wind force on the minor sail is $1\mathrm{.}6$ kN at a

height of $2$ m above the level of $C.$ The water resistance $R=c{v}^2$ acts at $0\mathrm{.}25$ m above $C.$ The

weight of the boat is $800(1+0\mathrm{.}01)kg$ and $a=0\mathrm{.}8(1-0\mathrm{.}02)\frac{m}{s^2}.$ Find velocity $v,$

water resistance $R,$ the buoyancy force $B$ and the resultant of the lateral forces on the boat.

$[$Note: The Buoyancy force need not act directly below C$,$ but will act somewhere along the

line of symmetry of the boatl.

Figure $3($Dimensions for $====0)$