Question

A girl of mass 40 kg climbs 50 stairs of average height 20 cm each in 50 s. Find the power of the girl, (g = 10 ms^–2)
(A) 50 W (B) 50 × 20 W (C) 80 W (D) 50 × 20 × 2 W

Answer 1

Dear Student
$$\begin{gathered} Mass=40Kg \\ height=20/100\times 50=10m \\ Power=mgh/time=40\times 10\times 10/50=80W \\ Regards \end{gathered}$$