
⇰Let O be the point of observation on the ground OX.
⇰Let A and B be the two positions of the jet.

















![\bf[ \boxed{➯OM=OL+LM=OL+AB=(x+3000)m \: and \: BM=h \: m]}](https://tex.z-dn.net/?f=%20%5Cbf%5B%20%5Cboxed%7B%E2%9E%AFOM%3DOL%2BLM%3DOL%2BAB%3D%28x%2B3000%29m%20%20%5C%3A%20and%20%5C%3A%20BM%3Dh%20%5C%3A%20m%5D%7D)


⇰ Equating the value of x from (1) and (2),we get;





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Answer:
A and C are both long term challenges, I'm pretty sure it's A.
Explanation:
Personal experience, I have arthritis and it's a long term challenge.
Energy is calories.. so your losing calories.. but if you don't intake more calories.. then your body will hold on the what calories you have left and hold on to any calories in whatever it is you eat...
so yes, more energy out than energy in over time equals weight gain.
it is true.