Fizjoterapia i rehabilitacja pomagają po wypadku.

Because the subject has two things joined by i: fizjoterapia i rehabilitacja.

In Polish, when two nouns are connected by i and together form the subject, the verb normally goes in the plural:

• Fizjoterapia pomaga = Physiotherapy helps.
• Rehabilitacja pomaga = Rehabilitation helps.
• Fizjoterapia i rehabilitacja pomagają = Physiotherapy and rehabilitation help.

So pomagają agrees with the whole compound subject, not with just one noun.

The dictionary form is pomagać, which means to help.

Pomagają is:

• 3rd person plural
• present tense
• from the imperfective verb pomagać

So it literally means they help.

Here, the they is not people; it refers to fizjoterapia i rehabilitacja.

Because the preposition po in the meaning after requires the locative case.

The noun wypadek changes in the locative singular:

• nominative: wypadek
• locative: wypadku

So:

• po wypadku = after an accident / after the accident

This is a very common pattern in Polish: a preposition forces a certain case, and the noun changes form.

It is the locative singular of wypadek.

In this sentence:

• po = after
• po + locative
• therefore wypadek becomes wypadku

So po wypadku is a prepositional phrase in the locative.

Because Polish does not have articles like English a/an/the.

So wypadek or wypadku can mean:

• an accident
• the accident

The exact meaning depends on context.

That means po wypadku could be understood as:

• after an accident
• after the accident

English has to choose an article, but Polish usually does not.

Not exactly. They are related, but not always identical.

• fizjoterapia = physiotherapy / physical therapy
• rehabilitacja = rehabilitation

In real usage, rehabilitacja can be broader. It may include recovery treatment more generally, while fizjoterapia is more specifically physical therapy techniques and exercises.

In everyday speech, though, the two can appear together naturally, as in this sentence.

Yes. Polish word order is more flexible than English word order.

The neutral version here is:

• Fizjoterapia i rehabilitacja pomagają po wypadku.

But you could also say:

• Po wypadku pomagają fizjoterapia i rehabilitacja.

This can shift the emphasis slightly:

• starting with Po wypadku highlights the situation first
• starting with Fizjoterapia i rehabilitacja highlights what helps

The meaning stays basically the same.

Yes. Polish uses the present tense for general truths and regular situations, just like English often does.

So pomagają can mean:

• they help
• they are helpful
• they help after an accident in a general sense

It does not have to refer only to something happening right now at this exact moment.

The letter ą is a nasal vowel, but in actual speech its sound depends on the position in the word.

In pomagają, the ending -ją is often pronounced roughly like -yom or -jow̃, depending on the speaker and style. For an English speaker, a useful practical approximation is:

• po-ma-GA-yon

But this is only an approximation. The important points are:

• stress falls on the second-to-last syllable: po-ma-GA-ją
• ą is not exactly the same as a plain English o or on
• you will hear some variation in natural speech

Yes, absolutely.

If you use only one subject, the verb becomes singular:

• Fizjoterapia pomaga po wypadku.
• Rehabilitacja pomaga po wypadku.

If you use both together, the verb becomes plural:

• Fizjoterapia i rehabilitacja pomagają po wypadku.

So the verb form depends on whether the subject is singular or compound.

Not in every possible use of po, but in the meaning after, yes, it takes the locative.

So with time/sequence meanings like after X, you should expect:

• po obiedzie = after dinner
• po pracy = after work
• po wypadku = after an accident

For this sentence, the key rule is simple:

• po meaning after
  • locative