Pick it up and carry it!! Is there more of a question here?? Need some background if you want a real answer.
As CPPMable suggests, there should be more initial conditions defined in terms of the system. For example, does your objects move up or down, and move with a slope? If you want to move two objects at the same time, a pulley system can be used in this application. There are many ways to counter this problem as long as you define the conditions of your system.
Well, this question was brought to my attention when I was interviewed for a design job. I don't know if it was a kind of a tricky question or not, but my answer was; "just grab it and move it". Thanks for replying.
