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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