I find the brakes discussion interesting in this.. Something you might find interesting.
IF you have aux brakes on the car you tow so that when the brakes lock, ALL THE WHEELS ON THE GROUND are locked.. Then the math that predicts how long it will take you to stop.. Well the full formula is fairly complex but for any given stretch of highway at any given hour of the day (Different roads, different times, Different K) it boils down to:
(Speed squared)/K (where K is the same for ALL vehicles)
Condition of tires does not matter, And though Condition of road affects "K", it is the same for all vehicles, Weather conditions affect K but again at any given point in time that is the same for all vehicles.
The MASS of a 40 Ton Semi is a bit more than the MASS of a 1 ton car, but the weight, is also greater in the same radio so that factors out.
HOWEVER.. If you do not have a brake system on the towed.
It gets much, much, much, more complex.
Oh, for clean dry "Reference" pavement, 20 MPH skid distance is 22 Feet, 40 is thus 88
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