6188. A rectangular surface 3′ x 4′, has the lower 3 edge horizontal and 6′ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is(where, y = specific weight of water) September 7, 2025 by Admin 39.6y 48y 49.2y 58y ✅ The correct answer is option B.