Mass of 2.6kg lies on a frictionless table, pulled by another mass of 4.1kg under the influence of gravity (mass 4.1kg is hanging off the edge of the table). The acceleration due to gravity is 9.8m/s^2. What is the magnitude of the net external force (gravitational) acting on the two masses? I thought I'd get the answer by using F=g(m1)(m2), but that was wrong. I don't know where to go from here.