A rectangular retaining wall is to be built to retain soil at a height of 5m. The wall is to be made of M25 concrete and will have a thickness of 0.5m. The soil on the back of the wall has a weight density of 18 kN/m^3 and the wall will be subjected to a horizontal earth pressure of 0.5g. Determine the required width of the base of the retaining wall and the maximum bending moment that it will experience.

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