here is a question that I am unable to solve: The average human, of mass 52 kg needs to have approximately 9,000,000 J of energy per day. Suppose, you had to walk up a hill with an incline of 12 degrees. Determine the following: a) how high would the hill have to be (i.e. - change in height) in order to consume all of this energy. b) how much work did gravity do in all of this walking? for A, i know you have to use the formula Eg=mgh but i am not sure where to sub in the energy as 9,000,000J or sin 12*9,000,000 (since its at an angle) B) i dont knoe what role gravity plays in this?