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**[SOLVED] Finding Center of mass**

**1. Homework Statement**

Three cubes, of side 0, 20, and 30, are placed next to one another (in contact) with their centers along a straight line as shown in the figure. What is the position, along this line, of the CM of this system? Assume the cubes are made of the same uniform material and 0 = 2.5 cm.

**2. Homework Equations**

Xcm = m1x1 + m2x2.../ m1 + m2 +....

**3. The Attempt at a Solution**

it does not give the mass of the cubes, so i dont know how to relate to such a problem