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## Homework Statement

A 5.5 x 10^4 kg airplane, travelling at an altitude of 9.9 km, has a speed of 260 m/s relative to the ground. Nearing the end of the flight, the plane slows to a speed of 140 m/s while descending to an altitude of 2.1 km. Determine the plane's total loss of mechanical energy during this change of speed and altitude.

## Homework Equations

[tex]E_g = mgh[/tex]

[tex]E_k = \frac{1}{2}mv^2[/tex]

## The Attempt at a Solution

I have no idea how to start to solve this problem. If someone could point me in the right direction, it would be great.