Mr. White drops a bowling ball and a feather from the top of the Washington Monument. a) Which will hit the ground first?  Why?

b) If Mr. White were to repeat this experiment inside a vacuum chamber, which would hit the ground first?  Why?

If you can provide some explanation I would greatly appreciate it! :)

A) The bowling ball will hit the ground first. It is heavier, which has greater density, allowing it to reach the ground first.

B) Feather. If you want to be able to blow a bowling ball in a vaccum cleaner, it's almost impossible since it's very heavy. If it's a feather, it would be easier as it's light and the air inside it is able to force it down.

Note: I haven't learnt physics at all yet, this is just an attempt. I'm in 7th grade currently and I will probably be taking physics sometime in 9th grade.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.