not if the mass is turning around !
on a track.

just like a pendulum.

the 100kg mass will not just stop as it turns around.
but it does apply a 4000N force to the pipe as it turns around.

you must have just dropped in.

you should read up on the issue before replying.

yes , the velocity difference or the change in velocity
is 80 m/s , I never questioned that.
I questioned kallogs use of the 80m/s * 100kg to get
a force of 8000N , that he applied to the pipe to cause
the pipe to stop and then move in the other direction.

I agree the pipe just stops with the force of 4000N

but a change in velocity is like this
---------------- -40 m/s ------------>
<--------------- +40 m/s -------------

it turned around add them up the total change

IN VELOCITY / DIRECTION is 80 m/s , thats not a FORCE
its a change in direction.

or you can do it like this
--------------- 40 m/s North------------>
<-------------- 40 m/s South-------------

total change in velocity is 80 m/s
its still not a force , its a change in direction.

its like driving your car at 50 miles per hour
for 30 minutes to point A
and then driving it back at 50 miles per hour
for 30 minutes to point B

the total change in velocity durring the 1 hour
is 100 miles per hour , but you never drove your
car over 50 miles an hour.

the change in velocity of the car required no extra gasoline than it would if you just
kept driving north for an entire hour.

do you have the comprehension ability to comprehend that?

because kallog couldnt ever grasp that.

or he was just using that to try to make it appear that the pipe would just go forward
then backward , resulting in the pipe never moving further than 16 meters in any direction.



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