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The force on one end is 19.6N and the force on the other is 67.2N. (opposing each other across the pulley)

So what I don't get is, how do you find the tension in the string?

I figured it was the sum of the forces on each end but it said that was wrong.

So then since it is a moving system, I tried subtracting the lesser force from the larger, and it said that was wrong too. :-/

Any advice???

Thanks