Newton\'s Law, conceptual question: Why is my answer wrong? Two identical blocks

Question

Newton's Law, conceptual question: Why is my answer wrong? Two identical blocks, 1 and 2 are connected by a massless string. In case A, a student pulls a string attached to block 2 such that the blocks travel to the right, across a desk, at a constant speed of 10 cm/s. In case B, the student pulls a string attached to block 1 such that the same blocks travel across the same desk to the left at a constant 20 cm/s. Will the tension in the diagonal string connecting the two blocks be greater in case A, greater in case B, or the same in both cases? Explain your reasoning.

Explanation / Answer

you are absolutely correct. Only reason it can be marked wrong is because you didn't mention that this tension will be 0. Since there are no acceleration, tension will be 0 in both cases. I think your teacher was expecting Zero.

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