the 2 seconds that you are using is a complete falsity.

How long do you think it'll take? Here's a hint. F=3900N, m=100kg, initial speed = 39m/s, F=ma. Any ideas?

Or rather than wasting time, why don't we just change the arbitrary 3900N force that you chose. Make the turnaround force 100,000N and it'll take much less than 2s.


because afterall that is what you are trying to do , you just cant do it because physics keeps getting in the way , spoiling your attempts.

I've noticed that every single insult you fire at me is actually describing yourself, not me. Where are your equations? I mean the ones using physics, not just made up. F=mv is just made up.