In a DND argument, not sure which formulas to use
Let's say, hypothetically, you could shrink a non regulation cannonball (in size and weight) to the size of a musketball and grow it at will. The volume of the cannonball is 4000x the volume of the musket ball (square cube law tells me that a cube of size change would have the s.a. of one size as 225x larger). If I grew the "bullet" as soon as I fired it, obviously it would slow faster after it grew, but how much faster? For the sake of variables, assume the bullet fires at 500ft/s and is transformed into the 4000x volume cannonball at 1ft