Sentences

1, Are both these sentences correct:

a) "The man hit the cow with so much strength that the cow got mad and kicked at thim."

b) "The cow kicked the man with so much strength that she broke his leg."

2. And are these sentences correct:

a) "The man hit the cow so hard that the cow got mad and kicked at thim."

b) "The cow kicked the man so hard that she broke his leg."

3. In the case that both are correct, which pair sounds better?