posted by zianna .
In one day, a 75-kg mountain climber ascends from the 1500-m level
on a vertical cli to the top at 2400 m. The next day, she descends
from the top to the base of the cli, which is at an elevation of 1350 m.
What is her change in gravitational potential energy (a) on the first
day and (b) on the second day.