It was a children versus grown-ups competition at school. One event required the adult to throw a basketball as far as he could. When it was the child's turn, he had to throw a baseball instead. The event coordinator said, "It's only fair!" Based on Newton's laws, was this event fair? Yes, because acceleration doesn't depend on the size of the object.
Yes, because an adult can apply more force than a child can. Making the adult's object bigger than the child's object helps to even out the acceleration.
No, because you must have the same size object in a competition.
No, because a basketball is bigger than a baseball, and objects that are bigger accelerate slower.