A vertical spring of force constant 100 Nm -1 is attached to the ceiling, with a block of mass 10 kg suspended from it. Now an external force F is applied on the block so that the spring is stretched by an additional length of 2 m. The work done by the force F is [Take g = 10 ms -2 ]
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A
x = elongation in spring due to mass 10 kg
=200J
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