Which physical parameter more than any other most probably controlled the early evolution of the planetary system and dictated the characteristics of the planets that eventually formed?

temperature distribution within the nebula

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.