Problem: A block, on a frictionless surface, is pulled horizontally by two opposing forces, F1 = 3 N to the left and F2 = 5 N to the right.
Part A: What are the magnitude and direction of a third force F3, such that the block will move with a continuous velocity of v = 3 m/s to the left?
I need help to determine the magnitude and direction of a third force.