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An object in motion will stay in motion, unless acted upon by an external forcepic.twitter.com/GVjVVOSQLg
This is what my twitter @ means The observers in the bed of the truck are moving at a 𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡 𝑣𝑒𝑙𝑜𝑐𝑖𝑡𝑦 We call such observers 𝑖𝑛𝑒𝑟𝑡𝑖𝑎𝑙 observers Einstein’s postulate states: “any two inertial observers must agree on the same laws of physics”
they should slam on the breaks when he's in the air. for further proof and for hilarity
Not a bad way to illustrate the principle! It only works because drag is negligible at this speed, though.
Maybe one of the reason why he is not standing up straight while jumping 
Took me a moment to figure out what the two guys where doing on the trampoline. They are deadening the rebound on the tramp to remove noise that may cause an undesired timeline.
I may be wrong, but I'd rather think they're increasing the "stretch" or "push" of the trampoline so the jumper flies higher.https://youtube.com/watch?v=HJ79PJq-CWY …
@maxr__x visual learning 
I wish I did that in physics
Where do I sign up to take the place of the guy who's jumping?
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