Work and Energy Question
Rene, whose mass is 85 kg, skis down a hill, passing a point Z with a kinetic energy of 9700J.
If friction is ignored, to what maximum height, h, can Rene ski? Relevant Equations ΔEp = ΔEk
ΔEp = ΔEk
for relevant equations I am not quite sure because one teacher showed us to use the one above while another teacher showed us the one below. Attempt For this question I am assuming that you use the above one because you are trying to find the final height "hf" for this question. So what I did was:
ΔEp = ΔEk
(mghf  mghi) = (1/2)mvf(squared)  (1/2)mvi(squared)
I continued to plug in the numbers and isolate the final height "hf", but then I encountered a problem because I don't know what the final velocity is "vf" so I don't know how to proceed.
