human
make me 4 high school physics problems about projectiles, provide an answer for each.  make one number in each problem a variable.  provide an equation to solve the problem in terms of the variable.
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
No
2. Is it implied multiple-choice question?
No
3. If two experts were independently asked the question, will the final answer be exactly the same?
No

--- Answer ---
open