Quote:
Here's my calculation that shows it must be applied for 2 seconds:

4000N = 100kg * a
a = 40m/s^2
That says the velocity of the mass increases by 40m/s each second. Since it started at -40m/s, after 1s it's reached 0m/s. After 2s it's reached +40m/s. That's the velocity it must have after leaving the turn, so it took 2s.

Either agree or identify the exact point where you think I made a mistake.


the lenght of the turnaround is what determines the time it takes for the mass to pass through it.

the mass is no longer being forcefully accelerated , it is only passing through the turnaround.

I realize there are forces inside the turnaround however.

if the turnaround is 40 meters in lenght the mass will pass
through the turnaround in 1 second because the mass has a velocity of 40 m/s.


if the turnaround is 20 meters in lenght the mass will pass
through the turnaround in 0.5 seconds because the mass has a velocity of 40 m/s.

I think we should use a turnaround lenght of 40 meters.

if that will assist our discussion.

and if we need to the lenght of the accelerator can be increased also.


3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.