hey whats mechanical energy got to do with it? +__+ yeesh

[puregoodboi]

a 55 kg high jump athlete leaps into the air in attempt to clear the bar, at the top of the leap the athlete has a total mechanical energy of 3x10 to the power of 10 joules and is moving at 8.33m/s.

Calculate the gravitational potentional energy.

what the hell? how do i get my height?
i have my mass which is 55

and gravity which is 9.8 soo what am i supposed to do?

how do i use mechanical energy too is it also work? how do i use that to get

answer? lol so confusing someone help please ^^

[rayveldkamp]

Well the total mechanical energy is equal to the sum of the kinetic energy and the potential energy, i.e:

3x10^10=1/2 m v^2 +mgh
so mgh=3x10^10 -1/2(55)(8.33)^2

Hope that helps
Ray

[puregoodboi]

lol thanks its for a friend i've only just learned conservation of energy but mechanical energy term really threw me off