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kinetic
kinetic energy (KE) of an object.
where m = mass of object
v = speed of object
The object is travelling at silly speeds though:

Then surely a 10 ton object at [highlight]50 bagillion kph[/highlight] would still make a big hole??

So Newtonian physics are no longer accurate.

Assuming 50 bagillion kph is still below light speed:

Your 10 ton object is going to obliterate the planet.