When its $75$ kWkW engine is generating full power, a small single$-$engine airplane with mass $650$ kgkg gains altitude at a rate of $2\mathrm{.}5$ m$/$sm$/$s$.$ What fraction of the engine power is being used to make the airplane climb? $($The remainder is used to overcome the effects of air resistance and of inefficiencies in the propeller and engine.$)$