What if Vesta Hits The Earth?

Vesta was discovered in 1807, it's the biggest asteroid in solar system. It's mass is 2500 Quintillion kgs and diameter of 525 kilometres. So, what will happen if Vesta hits the earth?
If that happens, It will hit our planet with a huge force and can destroy an entire country. Few weeks after the impact, dark clouds will cover entire earth and block sunlight for reaching us.
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