# How rough was the redirecting, re-entry and landing of the first stage of the Falcon 9?

How big was the acceleration during the different phases after the stage separation? Would it be safe to land a human being that way? (at least taking only the g-forces into account, as I suppose there might be too much heat anyway by design).

I can think of 4 different phases:

• boostback burn
• re-entry aerobraking (maybe this one is not significant enough on its own if it "happens" at the same time as the burn)
• re-entry burn
• hover-slam
• It never de orbited since it never went to orbit. – Antzi Dec 22 '15 at 20:08
• @Antzi true. Tried to fix that but I could only come up with "redirecting". Maybe you can suggest a better term. – jkavalik Dec 22 '15 at 20:16

• the speed of the stage at separation is 5000 km/h. The boostback burn reduces that to 0 and provides some speed for the trip back, with a burn time of 30 seconds. For a speed of 0, acceleration is $46 m/s^2$ or 4.6 G. – Hobbes Dec 23 '15 at 14:22