Question at position 4 The diagram below shows a board on top of two bricks with a cylinder on top of the board. The board exerts an upward force of 50 N. Which best explains this situation? Links to an external site. The diagram below shows a board on top of two bricks with a cylinder on top of the board. The board exerts an upward force of 50 N. Which best explains this situation? Links to an external site. The combined weight of the two bricks is 50 N. The cylinder has a weight of 50 N. The board has a weight of 50 N. The combined weight of the bricks, board, and cylinder is 50 N.