Which is the correct adverb? Or can both be used?

If so, how should one decide which one to use?

closed as primarily opinion-based by Drew, tchrist, Nicole, Centaurus, Hellion Apr 13 '15 at 15:53

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Throw the ball hard means 'throw it with high velocity, using as much power as you can muster'.

Throw the ball fast, means 'be quick about picking it up and throwing it'.

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