Dasari wrote:Even assuming that the last communication was at 300m (based on the last point on graph), the concern we have is that the rate of descent from 2.1km to 300m was too fast for the craft to survive. As per ISRO's plan from 500m altitude the decent has to be 1m/sec. Leaving aside the path between 2.1km to 500m, it should have taken 200 seconds to come down from 500m to 300m. But that didn't happen. Only hope is that it somehow corrected itself after 300m and didn't crash too hard. As Gagan eludes there is still slight chance for miracle that it may revive itself.
The plot that Gagan posted doesn't show speed in the sense of "distance over time" it shows vertical speed relative to horizontal speed. Something happened to affect this ratio. The same graph can be generated if the horizontal speed was reduced a lot, without affecting the rate of descent. Need some way to get a time axis on the graph, then rates of descent can be inferred, and that would indicate whether or not rockets fired or shut off correctly.
EDIT: Ah wait, it's a video, not a picture. OK, that changes things (assuming the video is real-time - probably is). Will get back on this.