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A cuboid of dimentions l*b*h is laying on the floor with it length and breath touching the ground if it hs to be raised with its breath and height touching

the ground find work done
cnt understand d question



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Initially, length and breadth were touching the ground.
Height of center of mass(CM), = h/2
potential energy(initial PE) = mg(h/2) = mgh/2

finally, breadth and height were touching the ground
Height of center of mass(CM), = l/2
potential energy(final PE) = mg(h/2) = mgl/2

work done = change in energy = final PE - initial PE = mgl/2 - mgh/2 = mg(l-h)/2
work done is mg(l-h)/2.
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