plz ans.... .............
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Answer:
5000J
Explanation:
the centre of the block will be at a depth of ½m.
mass of the water in the vessel= 1m³ × 1000kg/m³ = 1000kg
let us consider the potential energy at the base to be 0J.
potential energy of the water = mgh
= 1000 × 10 × ½ J = 5000J
•°•, taking out the water simply means to make its gravitational potential energy equal to the energy if the centre of mass will be at a height of 1m ( centre of mass after taking the water out )
potential energy of water when COM is at a height of 1m = 1000×10×1J
= 10000J
•°•, minimum work done = 10000 - 5000 = 5000J
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