The three particles in are initially at rest. Each experiences an external force due to bodies outside the three system. The directions are indicated. and the magnitudes.

SOLUTION: The position of the center of mass, calculated by the method is marked by a dot in the figure. One Key Idea here is that we can treat the center of mass.

We can evaluate the right side of directly on a vector capable calculator. or we can rewrite in component form. find the components. Along the x axis. we have,