A student wishes to work out how much power she uses to lift her body when climbing a flight of stairs.
Her body mass is 60 kg and the vertical height of the stairs is 3.0 m.
She takes 12 s to walk up the stairs.
(a) Calculate
(I) the work done in raising her body mass as she climbs the stairs,
work
(ii) the output power she develops when raising her body mass.
(b) At the top of the stairs she has gravitational potential energy.
Describe the energy transformations taking place as she walks back down
the stairs and stops at the bottom.
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