Technically, that's probably true. If we came back in 200 years, our scientific knowledge would probably be on the junk pile of history. Just as the 3,500 year old "science" in the Bible is on the junk pile today.
Uhm, no. What's in the Bible isn't science at all, and real science rarely turns out to be completely wrong the way the Bible is. Newtonian mechanics are not on the junk pile of history--we simply recognize the limits of their application. A lot of engineering, even today, is done with classical mechanics and electrodynamics--and the designs work.
Newtonian mechanics are inaccurate, but, because in a wide range of cases, the inaccuracies are small, they aren't wrong.
Example:
pi = 100 is outright wrong.
pi = 3 is extremely inaccurate, and most people would probably say it's still wrong.
pi = 3.14--wrong, or inaccurate?
pi = 3.1416--still wrong?
pi = 3.14159265358979323846264338327950288419716939937510
Is that last value still wrong? Technically, yes--it's not exactly pi.
Or, as Isaac Asimov put it:
"When people thought the Earth was flat, they were wrong. When people thought the Earth was spherical, they were wrong. But if you think that thinking the Earth is spherical is just as wrong as thinking it is flat, than you are wronger than both of them put together."
