That strongly depends on your reference frame. As in, what system are you looking at? Where are you drawing your box? If your box is around the entire universe, then yes, every action is a reaction stemming from the big bang, with very few notable exceptions pertaining to black holes that I wont go into.
However, if your reference frame is a hand and a ball, then the hand pushing the ball is an original action, the ball moving its reaction.
I dont even try at this point. 11 dollars for shit I dont wanna watch, and there’s ads anyway? Yeah, no, I’m getting in the boat.
Because it fucking auto installs when you aren’t looking. Piece of shit
Same. Its not a fancy car, but its had no problem in almost a decade and gets good mileage. Download it all you like
If I had my current knowledge, low-level iron forging, agriculture, and architecture (cisterns, wells, deep food storage) and very rudimentary medicine because the wife is obsessed with various herbs that are used to make our modern medicine
If I was starting from scratch, probably just be decent at hunting because I have good hand eye coordination and maybe tracking
I get the confusion, but a reference frame is a very important limitation for calculating what you need. Its not about whether the arm exists behind the hand, but whether its effects are important for the calculation.
For the sake of the hand pushing the ball, its not. Only the momentum of the hand and the inertia of the ball are important.