[dr_lew]

The accumulation can be additive at an increasing rate resulting in an exponential yield. Conservation of momentum applies here.

Constant acceleration is an increase in displacement at a rate linearly increasing with time.

Exponential increase depends on a rate of increase proportional to the size of the thing being increased. That's it. dy/dx = a y, or dy/y = a dx ... solution is y = y0 exp ( a x ) ( with y=y0 at x=0)

[Hostage]

Who said anything about ‘constant’ acceleration?