calculus

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A trough has a trapezoidal cross section with a height of 5 m and horizontal sides of width 2.5 m and 5 m. Assume the length of the trough is 14 m.

How much work (in joules) is required to pump the water out of the trough (to the level of the top of the trough) when it is full?

If the length is doubled is the required work doubled?

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