Question

If a builder of mass 75kg climbs a vertical ladder of 25m how much energy has she gained ?

Answer 1

So,

GPE (graviational potential energy) = mass x g x height

GPE is depends on where zero height is defined. In this situation, we define h = 0 as the initial height.


`GPE = 75 \ kg*9.8 \ (m)/(s^2)*25 \ m`


`GPE = 18,375 (kg*m^2)/(s^2)`


`GPE = 18,375 \ joules(J) \ or \ 18.375 \ kilojoules(kJ)`

The builder has gained 18.375 kJ of PE.