A bucket begins holding 25 kgs of sand. The bucket is to be
lifted to the top of a 15 meter tall building by a rope with
density 0.1 kg/m. However, the bucket has a hole in it, and leaks
0.2 kgs of sand each meter it is lifted.
Find the work done lifting the bucket and rope to the top of the
building. Use 9.8 m/s2 for gravity.
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