Quote:
then you can work out the resulting velocities (or momentums) with one of the online calculators

https://www.msu.edu/~brechtjo/physics/airTrack/airTrack.html

okay

red cart 6100 kg mass v +12.84 m/s
blue cart 100 kg mass v -40 m/s

results show that the blue cart bounces off of the red cart
the red cart continues in the + direction.

red cart velocity = +11.13 m/s

blue cart velocity = +63.97 m/s

neither cart is traveling in the negative direction.



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