DBZ Strike Force Question

I see a lot of threads that ask the question about speed vs strength, and most say that speed increases the force behind a strike.

So I ask the question, How much damage could Goku at full powered SS3 and SSG cause a planet if he were to smash into it at top speed coming down from the Earths upper atmosphere???

Would it be small crater, large crater, small island, city busting, country busting, continent busting, etc etc etc???

i think Goku has enough physical strength to harm beings like Superman and Thor.

I think his speed increases the force of his blows dramatically!

@warcry80: If they do not implement KI control, Earth would be long gone.

@warcry80: Only if you know how fast they're going (scientific method). Otherwise, the best way to determine is from relative size of the crater (artistic method).

Thanks for your input guys! i wonder if there is a way to measure the force needed to send someone miles through large formations or the force needed to cause a mushroom cloud after knocking someone to the ground with a punch?