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Work done in lifting a body is calculated by

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Weight of the body \times vertical distance moved

Force acting on the body \times vertical distance moved

Mass of the body \times vertical distance moved

None of the above

answer is B.

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Detailed Solution

Work done in lifting a body is calculated by

Force acting on the body \times vertical distance moved

Work is defined as “the energy transferred to or from an object via the application of force along a displacement.” It is a product of force

(F)

and displacement

(s)

.Mathematically, Work

(W)

is represented as

W = F \times s

The force a person has to use in order to lift the object of mass

(m)

is used to overcome the pull of gravity

(g)

, i.e., weight and displacement of the body will be equal to the height it is raised to.
Therefore,

Force applied = mg

vertical height = H

W = mgh

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