(adsbygoogle = window.adsbygoogle || []).push({}); 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.

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# Homework Help: Finding altitude on the moon

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