You are holding a gun, and shoot an apple, that is on a pole (stick). Find the height of the pole, if you know the apple fell $180$ meters from the pole base.
We know, the gun shoots at $u=10 \frac{km}{s}$, the bullet's of mass $10$ $ grams$, the apple is $1$ $kg$ , and when the bullet penetrates the apple, its speed is reduced by a factor of $10$. ($g$ is approximated as $10\frac{ m}{s^2}$)

Don't insert the unit. Your answer should be in $m$