A baseball would hit the bat harder. This is because the baseball is a lot heavier and more dense than the plastic ball. The keyword that you're looking for is density. The baseball is dense.
Answer: it would be A
Explanation: how are we to measure the air of a square mile
The maximum force is 6.4 KN. Check the attached file for the explanation.
The Resistance needs to be the same to allow the current to double with the voltage.