I’m just curious do you have threads on physics forums about this phenomenon as suggested by others above? could be a interesting read.
What happens if at the bottom of the hill you throw extra hard, and the bottle starts moving backward relative to the ground
Do you go faster or slower?
Absolutely technically yes and I love you for pointing that out.
But the momentum able to be gained from throwing a water bottle backwards is so significantly negligible due to the mass frame of reference being so outweighed that it isn’t even worth considering.
Take the example to an absolute extreme (infinite limit) and you are pushing off of an infinitely heavy wall (while moving, if that were possible). Even then… you would feel the same amount of acceleration as if you were standing still and pushing off of a wall. You’d go what, a few meters in distance total? The acceleration achieved in that small feat over an arms length distance (energy transfer is only happening while in contact with the object) is silly, especially when you factor in that you’ve had to accelerate the added weight with you to speed to begin with.
Now for the real question:
If we have an infinite number of esk8rs trying to push a boulder up a hill along with an infinite number of water bottles, could Sisyphus finally do a kickflip?
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The next time I have explosively violent diarrhea I will test this out and record my 0-20 launch time.
The key to success is you need to aim the explosive shit behind you, so that it propels you forward.
Simply letting the turd drop out of you toward the ground will not increase your forward acceleration.
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Okokokookokokokokokokokok!!!
In my tests, I have found a bottle full of red flavored Gatorade will give you more acceleration than plain H2O. Must be the electrolytes & red flavor
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What if you piss in the bottle while you’re moving?
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reducing mass will increase the amount of acceleration you get for a given amount of force. so… hold the turds down the hill. let em rip before climbing the next one.
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The faster boards in my collection are definitely quicker when I’m holding a beer, but I have not found, nor tried this for water.
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Playing the hits, professor 
Cant wait for you to go round 2 with @hummieee 
time is a flat circle, the past is doomed to repeat itself
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The original post–and apparently past ones as well–is what my philosophy professor called “intellectual masturbation” more than 20 years ago.
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More like a freaky circle.
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No, a “freaky circle” is what happens when you get @BillGordon @longhairedboy @jamie and @glyphiks in the same room with no supervision. It’s also incredibly lucrative to sell videos of on the dark web. Or so I’ve heard.
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My people will talk to your people.
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If they cant break physics with a longboard and a water bottle, then dont bother. I’ve got bigger fish to fry.
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You dont have any fish to fry, in fact you don’t eat meat, unless that too was a conspiracy.
let’s not ban him again, this is fuckin gold man
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You get more traction when holding the extra mass in, so you could theoretically hold the shit for the first couple mph of a launch, and after hooking release it for faster acceleration.
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Is there an upper limit to the effect? What if that was a 12pk?