By keeping the care at the highest possible level that you can offer and going above and beyond the job.
The correct answer from the list above would be "the bending of the arm". please rate and thanks :)

⇰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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