1. The problem statement, all variables and given/known data Brandon and Tom are climbing a mountain. He starts from an elevation of H1=511m above sea level. In 6.18 hours he climbs to an elevation of H2=2746m above sea level. The length of his path is L1=16000m. Brandon has a mass M1= 91.1kg and Tom has a mass M2=11.2kg Vertical velocity up the mountain=0.0985m/s Horizontal velocity down the mountain=0.141 m/s A)Calculate the change in gravitational potential energy for Brandon and for Tom as they make their climb in the Rockies. Delta GPE for Brandon= Delta GPE for Tom= B)Calculate the average kinetic energy for Brandon and for Tom as they climb up the mountain and as they descend. KE for Brandon going up= KE Tom going up KE for Brandon coming down = KE for Tom coming down= 2. Relevant equations A)GPE=mgh B)KE=1/2mv^2 3. The attempt at a solution It seems to simple for question A is too simple to be true so I'm concerned about wether it is correct. M computations: GPE=mgh =(91.1kg)(9.8m/s^2)h and (11.2kg)(9.8m/s^2)h Question:What height should i use for h? Is this the right equation? What is meant by Change in gravitational energy,do I have to subtract them? For B) KE=1/2mv^2 KE for Brandon going up KE=1/2(91.1kg)(0.0985 m/s^2)^2 =.441 KE Brandon going down KE=1/2(91.1kg)(0.141 m/s^2)^2 KE=.905 Whats the units for KE? Is this correct and if so should I do the same for Tom?