Ну-ка, расскажи правду.

Ну-ка is a little particle used to urge, prompt, or push someone to do something right now. In English, depending on tone, it can feel like:

• come on
• go on
• now then
• let’s hear it

So it does not really change the basic meaning, but it adds an extra feeling of insistence, encouragement, or sometimes challenge.

In this sentence, Ну-ка, расскажи правду sounds stronger than just Расскажи правду.

Because ну-ка is a fixed expression in Russian, and it is normally written with a hyphen.

This -ка element is a particle that often adds a conversational, urging, or softening tone. You can see it in other expressions too, such as:

• скажи-ка
• посмотри-ка
• ну-ка

So the hyphen is simply part of the standard spelling here.

When ну-ка stands at the beginning of a sentence like this, it is often separated by a comma because it functions a bit like an introductory urging particle.

So:

• Ну-ка, расскажи правду.

is the normal written punctuation.

You may also see -ка attached directly to the verb instead:

• Расскажи-ка правду.

That is slightly different in structure, but very similar in effect.

Расскажи is the imperative form of рассказать.

That means it is a command or request: tell.

More specifically, it is:

• second person singular
• used when speaking to one person
• usually informal / familiar

So you would say расскажи to one person you address as ты.

You would use расскажите instead of расскажи:

• Ну-ка, расскажите правду.

This can mean:

• speaking to several people
• or speaking politely/formally to one person

So the contrast is:

• расскажи = singular informal
• расскажите = plural or polite

Both verbs can sometimes be translated as tell or say, but they are not exactly the same.

• сказать = to say, to state
• рассказать = to tell, to narrate, to give an account

In расскажи правду, the idea is closer to tell the truth in the sense of give the true version / say what really happened.

If you said Скажи правду, that is also very natural Russian and may even be more common in some contexts. It feels a bit more like say the truth plainly.
Расскажи правду can suggest tell me the real story / tell me honestly what happened.

So both are possible, but рассказать has more of a telling / recounting flavor.

Because правду is the accusative singular form of правда.

Here, правду is the direct object of расскажи:

• расскажи что? → правду

So:

• nominative: правда
• accusative: правду

This is a very common pattern in Russian: the thing being told, said, seen, etc. often goes in the accusative.

Yes. In this sentence, правду means the truth.

Russian often uses правда in the same broad way English uses truth:

• сказать правду = to tell the truth
• говорить правду = to speak the truth
• расскажи правду = tell the truth / tell the real story

So this is a very standard and idiomatic use.

Not automatically, but it can sound:

• encouraging
• insistent
• playful
• suspicious
• even demanding

It depends heavily on intonation and the situation.

For example:

• said warmly, it can sound like Come on, tell the truth
• said sharply, it can sound like All right, out with it—tell the truth

The particle ну-ка often adds pressure, so the sentence is usually stronger than a neutral request.

Yes, Russian word order is flexible, but this order is very natural:

• Ну-ка, расскажи правду.

It puts the action tell in a prominent place right after the urging particle.

Other versions are possible, for example:

• Расскажи-ка правду.
• Правду расскажи. — more emphasis on the truth
• Ну-ка, правду расскажи. — also possible, with a different emphasis

So the word order can change, but the given sentence is a normal, idiomatic way to say it.

Рассказать is perfective.

In commands, the perfective often means do it once / produce a result / complete the action. Here the speaker wants a concrete result: tell the truth.

So расскажи means something like:

• go ahead and tell it
• give me the true account

If you used the imperfective imperative рассказывай, that would feel different. It could sound like:

• go on, keep talking
• go ahead, tell me
• start telling

So расскажи fits well when the speaker wants the truth as a completed piece of information.