How is Gravitational Potential Energy Lost by a Gliding Cessna-182?

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Homework Statement


A fully loaded Cessna-182 airplane of mass 1250 kg has an engine failure when flying with an airspeed of 126 km/h at an altitude of 2540 m on a calm day. It then glides at a constant glide angle (which is the direction of flight below the horizontal) towards a safe landing at this constant speed of 126 km/h experiencing a drag force of 1300 N that opposes the direction in which the plane is moving.
Please use: g = 9.81 m s-2


2. Homework Equations
Find the rate with which the loaded plane is losing gravitational potential energy.

the answer is 47.3 but i don't know how to get it
 
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this isite sux no relpy
 
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The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
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