A trough is 10 meters long, 2 meters wide, and 4 meters deep.
The vertical cross-section of the trough parallel to an end
is shaped like an isoceles triangle (with height 4 meters,
and base, on top, of length 2 meters).
The trough is full of water (density 1000 ).
Find the amount of work in joules required to empty the trough
by pumping the water over the top.
(Note: Use as the acceleration due to gravity.)
i got 196000 but it seems to be wrong
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