When work done by of gravity is negative,then
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Work done by gravity can be negative or positive depending on weather the body is being raised from earth or brought down towards earth. W = F X d X Cos (180) = -FXd which is negative work. Like-wise it will be positive when the mass comes down or accelerates towards the earth.
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When we lift an object work done by gravitation force is negative-mgh mean gravitation force is taking energy from the body
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