What do u call a pan spinning through space

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

Is a square always, sometimes, or never a parallelogram

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.