there are 2 questions which are driving me insane because I jus don't understand what to do! I hope that if someone could go through the questions in detail then I'll finally understand how to go about answering. 5. A rod AB of mass 6kg and length 3m has its centre of mass 1.2m from A. It is suspended horizontally from the ceiling by two vertical strings one attached at A and the other at point C where AC is 2.5m. Find the magnitude of the tensions in the strings. 7. A uniform plank AB is 6m long and is resting in a horizontal posotion on two supports at A and B. The mass of the plank is 20kg. A body of mass 30kg is placed on the plank 1m from A and a second body of mass 30kg is placed on the plank 4.5m from A. Calculate the reaction at A and B. the answers for 5 are 30.6N, 28.2N the answers for 7 are 417N , 368N thank you!