posted by Anonymous .
A thin 2 kg box rests on a 6 kg board that hangs over the table. the length of the board on the table is 30 cm and the length of the board hanging off the table is 20 cm.
How far can the center of the box be from the end of the table before the board begins to tilt?
I don't know how to set up the question.
Same question...NEED EXPLANATION as well