Two blocks of mass m1 = 8.0 kg and m3 = 6.3 kg, connected by a rod of mass m2 = 1.8 kg, are sitting on a very low-friction surface, and you push to the left on the right block (mass m1) with a constant force of (-30 , 0, 0)n. see figure below. (as usual, +x is to the right and +y is up. ignore effects due to friction between the objects)
what is the force f3 exerted by the rod on the block of mass m3?