Consider a cannonball which has been cut in half.
Glue the cut cannonball back together and drop it. --- It should fall the same as a whole cannonball.

Will the glued cannonball fall slower if we use poor glue? --- if we don't glue it at all?

Suppose we don't fit the two halves together at all?
Each half should fall the same as the whole cannonball.

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