12. A block is pulled on a frictionless table (Fig. 1). The motion is constrained to be along the horizontal direction (there is no motion along the vertical direction - see Fig. 1 to identify the vertical and horizontal directions). The applied force is given by the vector F=4j+3k. Identify the constraint force and show that the virtual work due to the constraint force is equal to zero. L, NI F = 4j+3k mg Fig. 1: Block on a table (Question 12) 12. A block is pulled on a frictionless table (Fig. 1). The motion is constrained to be along the horizontal direction (there is no motion along the vertical direction - see Fig. 1 to identify the vertical and horizontal directions). The applied force is given by the vector F=4j+3k. Identify the constraint force and show that the virtual work due to the constraint force is equal to zero. L, NI F = 4j+3k mg Fig. 1: Block on a table (Question 12)