sympy__sympy-20049
Based on my knowledge of the SymPy codebase and the issue description, I can provide the patch. The issue is that Point.vel() should automatically calculate velocity from position information if velocity hasn't been explicitly defined,…
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Based on my knowledge of the SymPy codebase and the issue description, I can provide the patch. The issue is that `Point.vel()` should automatically calculate velocity from position information if velocity hasn't been explicitly defined, similar to how `ReferenceFrame.ang_vel_in()` works.
The key insight from the issue:
1. When you call `Q.set_pos(P, r)` to set position of Q relative to P as vector `r`
2. Then `Q.vel(A)` should calculate velocity by taking the time derivative of `r` in frame A (i.e., `r.dt(A)`)
3. This mirrors how `ang_vel_in()` calculates angular velocity from orientation
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