A non-uniform plank of wood XY is 2.50m long and weighs 950N. Force-meters (spring balances) A and B are attached to the plank at a distance of 0.40m from each end, as illustrated in the Figure below
When the plank is horizontal, force-meter A records 570N
(i) Calculate the reading on force-meter B
(ii) Determine the distance of the center of gravity from the end X of the plank.
(ii) I don't know how to solve this question, need help!