Prepositions end up at the end of sentences that are using phrasal verbs, that is a verb plus a preposition where the preposition isn't starting a prepositional phrase. Phrasal verbs are perfectly okay and are very common in Germanic languages, less common in something like Latin.

English has several registers--levels of formality-- and phrasal verbs are not preferred in formal English.

Prepositions end up at the end of sentences that are using phrasal verbs, that is a verb plus a preposition where the preposition isn't starting a prepositional phrase. Phrasal verbs are perfectly okay and are very common in Germanic languages, less common in something like Latin.

English has several registers--levels of formality-- and phrasal verbs are not preferred in formal English.

Above link is dead wayback machine to the rescue until they go out of business.