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Q.

When a body is moving vertically up with constant velocity :
(i) work done by lifting force is positive
(ii) work done by lifting force is negative
(iii) work done by force of gravity is positive
(iv) work done by force of gravity is negative

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a

(ii, iv)

b

(ii, iii)

c

(i, iv)

d

(i, ii, iii)

answer is C.

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Detailed Solution

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Work done by lifting force is positive as the displacement is in the direction of applied force.

Work done by gravity force is negative as the displacement is in the opposite direction of gravity.

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