Hmm but couldn't we then also go even further and assume an idealized muscle car with an effective transmission to its wheels of 1:1 running at its optimal torque vs speed point and thus with a given speed of its wheels rotation for a given time?
Aka convert energy into miles (traveled) or something (with the choice of motor and wheel diameter and everything else standardized ofc.)?
The apostrophe abbreviates the es (to 's) that used to be part of the English possessive (as it still is on some words that end s)
It's a bit shit. Lots of people have trouble with it, lots of English as a second language people have trouble with not understanding what is replaced by the apostrophe