When the verbal noun simply reinforces its verb, it is used for emphasis.
ضَرَبْتُهُ ضَرْبًا
I certainly struck him.
- ضَرَبْتُ states the action.
- هُ is the maf'ul bihi: the person struck.
- ضَرْبًا is the mansub maf'ul mutlaq: it confirms the striking.
No adjective or number limits ضَرْبًا here, so its job is emphasis.
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Maf'ul Mutlaq: Emphasis, Quality and Number
When the verbal noun simply reinforces its verb, it is used for emphasis.
ضَرَبْتُهُ ضَرْبًا
I certainly struck him.
- ضَرَبْتُ states the action.
- هُ is the maf'ul bihi: the person struck.
- ضَرْبًا is the mansub maf'ul mutlaq: it confirms the striking.
No adjective or number limits ضَرْبًا here, so its job is emphasis.