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I've tried to do a few problems from an extensive list of homework problems we were assigned, but I am stuck on them.. I will show you how far I got, if anyone can see where I went wrong please reply.. thanks.

51. Two blocks connected by a rope of negligible mass are being dragged by a horizontal force F. Suppose that F = 68N, mass1 = 12kg, and mass2 = 18kg, and the coefficient of kinetic friction between each block and the surface is 0.100. (b) Determine the tension T and the magnitude of the acceleration of the system

First, I created two separate free body diagrams.. and I calculated the weight of each mass. Then I attempted to use the equation Acc = F (force to acc system) / total mass .. however, this gives an incorrect result. The correct answers are tension = 27.2N and acc = 1.29m/s^2.

I have tried re-arranging amongst other things, and nothing seems to work. Does anyone see where I might have gone wrong? Thanks.

Todd