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並前往https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-work-energy/in-in-work/v/work-done-on-liftingfalling-things-solved-numerical-work-energy-physics-khan-academy

Work done on lifting/falling things - Solved numerical - Khan ...

Let's calculate 2 problems on work done on lifting & falling bodies. ... her balance and the rod will fall down on the floor due to gravitational force.

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