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Problem:

and from the equations of the drum 2, I get

Since drum 2 must stay on the bottom drums, so it will not fly up, thus

I got the upper bound of the acceleration, but I don't know if it is correct.

My question:

Although I got the seemingly correct upper bound of the acceleration, but I don't know how I can get the lower bound of the acceleration?

**Attempt:**I tried to solve the range by listing out the newton's 2nd laws of each drum**
**and from the equations of the drum 2, I get

**
**Since drum 2 must stay on the bottom drums, so it will not fly up, thus

I got the upper bound of the acceleration, but I don't know if it is correct.

My question:

Although I got the seemingly correct upper bound of the acceleration, but I don't know how I can get the lower bound of the acceleration?

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