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I think the old SciFi classic "Zone of Thought" and the other book which name escapes me now explorer this idea, although not 5Km/h.

To stop a 'blight' in the universe, some natural laws have to be changed wherever it starts to spread, is the story premise if memory serves me.

The third volume of « Three body problem » and its fan-written and author-approved sequel deal with those local physical constants changes !

"A Fire Upon the Deep" and "a Deepness in the Sky" by Vernor Vinge

Deepness in the Sky "programmer-archaeologist" will never come to pass because of LLMs :(

The Forever War series changes the speed of light at the end to mess with the mortals, not to prevent any calamity however.