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## Homework Statement

Explorers in the jungle find an ancient monument in the shape of a large isosceles triangle. The monument is made from tens of thousands of small stone blocks of density 3 800 kg/m

^{3}. The monument is 15.7 m high and 64.8 m wide at its base and is everywhere 3.60 m thick from front to back. Before the monument was built many years ago, all the stone blocks lay on the ground. How much work did labourers do on the blocks to put them in position while building the entire monument?

## Homework Equations

the gravitational potential energy of an object-Earth system is given by U

_{g}= Mgy

_{CM}, where M is the total mass of the object and y

_{CM}is the elevation of its centre of mass above the chosen reference level.

## The Attempt at a Solution

So, I have to find the y-coordinate of the centre of mass, but I'm not sure how to go about doing it... Is integration necessary here? Very confused :(