Is a baseball and cannon are dropped from the same height at the same time, which ball will hit the ground first?

Depends on the height. If they are dropped at a height which is high enough for them to reach terminal velocity, they will hit the ground at the same time. However, if they are dropped from a lower height, say, an average rooftop, the cannon will hit the ground first because it has the greater mass

Yup no bull frogs here man