Question

A elevator moves height h in time t with constant speed. If the total mass of elevator has m and the magnitude of acceleration due to gravity is g. Calculate the power required to move the height h.

• A. $mgt$
• B. $mgh$
• C. $mgh/t$
• D. $mgt/h^2$
• E. $\frac{1}{2}m(h/t{)}^2$

Answer 1

The correct option is C $mgh/t$

Work done in moving an elevator upto height h $W=mgh$

$\therefore$ Power required $P=\frac{W}{t}=\frac{mgh}{t}$