A girl of mass 38 kg climbs 15 steps. Each step is 0.18 m high…

Lifting at a steady speed needs a force equal to the weight $mg$, so $W = mgh$ with $g = 9.8\ \text{m/s}^2$. Only the height counts, not the path. Pulling along level ground at a steady speed: $W = f \times s$, with $f$ the friction force.