Finding altitude on the moon (urgent) 1. The problem statement, all variables and given/known data A projectile is launched vertically from the surface of the Moon with an initial speed of 1700 m/s. At what altitude is the projectile's speed 27% of its initial value? 2. Relevant equations Kinematics, Conservation of energy 3. The attempt at a solution I tried using First kinematics and solved for t, using t I plugged it into the 2nd kinematics, but the solution was wrong because of change in altitude. Since altitude changes, the gravity will also change as altitude increases. I then tried using Vf = square root 2Gm/Xr solving for x, but this came to a small increase in altitude which would not make sense as an answer. Any ideas or how to find the solution to this problem? I've tried every method I could think of, but none of the solutions work.