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Q.

Is it true that work done against gravity is negative?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
Work done depends on the force applied to an object, its displacement, and the angle between the direction of force applied and displacement. When an object moves upward, displacement is upward, and the gravitational force acting is towards downwards (opposite to that of displacement), making an angle of

18 0^{o}

As

\cos 18 0^{o} = - 1

.
So,

W = - Fs

, this means work done against gravity is negative.

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Is it true that work done against gravity is negative?