4. A uniform board with a weight of C N and a length of 2.0m rests horizontally on two supports as shown. One support on the left end of the board, while the other support is 1.5 m from left end. a. Draw free body diagram for the board with all the forces? b. Find two support forces by using equilibrium conditions? Explain which equilibrium condition you use and how? c. If you have only one support to balance the uniform board. If you use block of mass 3.0kg on top of the right end of the board as shown. What will be the balance distance to the pivot from left side of the board?