A gigantic pyramid was found buried in the sand in the Sahara desert! The very tip of the pyramid is at ground level. The distances pictured below are in km. We wish to know how much work is required to excavate the pyramid up to ground level. Assume the pyramid is made of very small bricks with a density 2000 kg/km3 and gravity is approximately 10 N/kg Recallthe units 1 IL] 2 (1 km) - [1 N} Write the integral that calculates the work required to excavate the pyramid In kJ