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A bag of grains of mass 2kg is lifted through a height of 5m. How much work Is done by lift source?

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A bag of grains of mass 2kg is lifted through a height of 5m. How much work Is done by lift source?

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a W = mgh = 2 × 9.8 × 5 = + 98 Jb The work done by gravity is –98 J

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