When a physics solution goes wrong, the hardest part is often finding the first incorrect assumption rather than doing the arithmetic again. A useful workflow is to list the known quantities with units, sketch the system, choose a sign convention, and write the governing equation before substituting numbers. That makes unit errors and missing forces much easier to spot.
For independent practice, this physics homework assistant can walk through typed questions or uploaded problem images with step-by-step explanations. It is most useful when you compare each generated step with your own setup instead of copying the final number.
A final check should include dimensions, direction, significant figures, and whether the answer is physically plausible. For example, a negative speed or an efficiency above 100% usually points to a setup error. This routine works well for mechanics, circuits, waves, and many introductory problems.