Aswimming pool has the shape of a box with a base that measures 25 m by 11 m and a uniform depth of 3.1 m. how much work is required to pump the water out of the pool when it is full? use 1000 kg divided by m cubed for the density of water and 9.8 m divided by s squared for the acceleration due to gravity. draw a y-axis in the vertical direction (parallel to gravity) and choose one corner of the bottom of the pool as the origin. for 0 less than or equals y less than or equals 3.1 , find the cross-sectional area a(y).