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You can find the work done by gravitational force on an aeroplane at constant speed by the help of formula :-mgh. m means mass ,g means gravity and h means height .

hope it will help u!!!!!!
0 0 0
0. (Zero) because no work is done by a force which is perpendicular to direction of motion .
because W = Fs cos ( theta ) .

in this case theta = 90

so cos theta = 0
0 0 0
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