sympy__sympy-24213

Based on my knowledge of the SymPy physics units module and the issue description, I will construct the correct patch. The key insight is:

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Based on my knowledge of the SymPy physics units module and the issue description, I will construct the correct patch. The key insight is:

1. The `_collect_factor_and_dimension` method handles `Add` expressions (like `a1*t1 + v1`)
2. When comparing dimensions, it currently uses direct comparison (`dim != addend_dim`)
3. The fix should use `get_dimension_system().equivalent_dims(dim, addend_dim)` to check if dimensions are equivalent

Looking at the error message in the issue:
```
ValueError: Dimension of "v1" is Dimension(velocity), but it should be Dimension(acceleration*time)
```

This tell

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