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Displacement

When is work ...

Question

When is work said to be done against the force of gravity?

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Solution

Work done by a body is against the applied force if the displacement is in a direction opposite to the force. In the case of gravity, if a body is lifted above the ground, work is done against gravity.
$W . D . a g a i n s t g r a v i t y = F . d = m g (- h) = - m g h$

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