Solve the below problem:
Q: A temporary dam is constructed in a 1.5-m-wide freshwater channel by nailing two boards to pilings located at the sides of the channel and propping a third board AB against the pilings and the floor of the channel. When rope BC is slack and neglecting friction, determine
(a) The horizontal force exerted on board AB by each of the pilings,
(b) The vertical force exerted on the top edge of board AB,
(c) The reaction at B.
