The horizontal force FP $=150$ N pushes the $18-$kg block$7\mathrm{.}5$ m up along the $32$ frictionless incline as shown in $($Figure $1).$A$)$ How much work is done by the gravitational force on the block during this displacement?

B$)$What is the speed of the block $($assume that it is zero initially$)$ after this displacement? Figure