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I’m interested to understand some of the mechanics involved in meteorites that originate from the asteroid belt. I have researched several including the Barringer and the one in Northern Canada in 2008 that was caught on multiple CCTV cameras. They all have very similar velocities before impact (20km/s).

Using the GPE calculation of E = GMm/R with R as the surface of the Earth and equating it to kinetic energy I get 11km/s impact speed. This assumes the meteorite started at rest when entering Earth’s gravitational field (and assumes it started at the edge of it as apprise to the asteroid belt). So this shortfall of 9km/s I’m assuming it starts off at 9km/s before heading to the Earth.

I understand that if they were assumed to start at rest then the impact velocity will be independent of the mass since the starting GPE will be equal to the final KE (conservation of mechanical energy).

So my main question- is it a coincidence that all these meteorites start off at 9km/s before heading to Earth? Is there a mechanism to explain this starting velocity when they get deflected out of the asteroid belt from Jupiter’s gravity?

Thanks for any insights offered.