How much work is done on lifting a body of 1 kg upto the distance of 1 m above the ground or vertically?

5.6 J

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2.3 J

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100 J

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9.8 J

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None of these

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Solution

The correct option is D 9.8 J
When a body of 1 kg wt. is lifted upward, it require the force of 9.8 N.
Hence, the work done = Force $\times$ Displacement = 9.8 N $\times$ 1 m = 9.8 Nm = 9.8 J. Therefore, option D is correct and rest of the option is incorrect .

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