A rock dropped near the surface of the Earth will fall with acceleration g. But other astronomical bodies should affect the motion as well. Suppose the Sun is near the horizon. Then (vector)g should now be a vector with a horizontal (x) component. What is g_x? What if it was the Moon near the horizon? Taking the bigger of these two cases determine the deflection from the vertical of a rock dropped 10m. Do you think it would be possible to measure the deflection? (We define vertical by the direction the rock would fall if the Sun/ Moon ignored.)

Lance - we won't do your homewrok for you, but will be happy to check your work or help if you show us your attempt and where you get stuck.

Net Force on such a rock must be:http://en.wikipedia.org/wiki/Terminal_speedhttp://en.wikipedia.org/wiki/N-body_problem

physic - for some reason you have provided an equation that describes the net force on a falling object with air resistance. That has nothing to do with the OP's question. You also provided a link to a wikipedia page that talks about orbital mechanics of systems of more than three or more bodies - again, not what the OP asked about.

No.