Well the aircraft went from 0 to 85' so I would assume that qualifies as positive rate.
Yes IF splitting hairs - it does BUT !
But it seems to me that in real life - what is needed is to define positive rate as a combination of two factors Increasing air speed AND increasing altitude as a minimum useful definition.
When inerita/energy available as a function of speed is traded for altitude gain, the speed will decrease.
Via wiki- consider a bicycle or car or plane going x miles per hour and as it starts UP a hill by coasting, with NO additional power /pedaling /thrust applied it will eventually stop- and absent sufficent pedaling or power input- it wil go back DOWN the hill
Ditto for an airplane with too late application of power.
