friction and terminal velocity of a parachutist vs a car

[Outlaw]

Originally Posted by raaaid

...
but I THINK this is also due to rolling friction increasing with velocity which what im studying denies or neglects...

Rolling friction assumes a single, 1 dimensional point of contact. This is not reality, but, it can approximate reality if proper judgement is used. The reality that most closely matches it is a railroad car (ie, metal wheel on a metal rail). No real text book would discuss rolling friction without noting its limitations.

In reality, tire companies and racers use friction coefficients much greater than 1 based on emperical studies.

--Outlaw.