So the body is 500 N downwards, while the 250 N tension, the unknown tension of the second chain, and the 125 N board all oppose it, and the fact that it's in equilibrium means that the sum of all the net forces is 0, but what after that?
Homework Statement
A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighting 500 N is sitting on the board. The tension in the right chain is:
a) 250 N
b) 375 N
c) 500 N
d) 625 N
e) 875 N
How far is the person from...