In the above question, the average power delivered by gravity is (1) \( -m g u \cos \alpha \) (2...

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In the above question, the average power delivered by gravity is
(1) \( -m g u \cos \alpha \)
(2) \( -m g u \sin \alpha \)
(3) \( -\frac{m g u \cos \alpha}{2} \)
(4) \( -\frac{m g u \sin \alpha}{2} \)
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