a pupil of mass 50 kg runs a flight of 20 stairs each 25cm high in a time of 20 seconds (take g= N/kg calculate the pupil s gain in potential energy

3 answers

answer
PE = mgh
so, how high did she go?

the time does not matter, unless you want the power, which is work/time

oh, yeah -- don't bother making a second post just insisting on an answer. It's annoying, and won't get any faster response.
Please work it out for me, please help me✍️