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Is this true?

The generalised momentum ̇ always equals mass × velocity

No — it is false.

The counterexample

This one comes with the Notes pack.

See pricing

85 counterexamples are free — including most of the ones Part C leans on hardest.

The kind of mistake this is

Property not inherited

A property assumed to pass to subobjects, quotients, or through a chain. It does not.

Drill statements like this
mechanics

Others that fail the same way

From Classical Mechanics › Lagrangian formalism and generalised coordinates

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