Matter, substance. Material howya call it.
A textbook would hit the ground first
Factors:
-Textbook weighs most
-Pillow is flat and fluffy not very aerodynamic) also is very light
-Paper airplane will glide to the ground do to its wings and will hit the ground last
27.9 idkkkk look it up on photomath
It takes twice the force to produce the same acceleration in the 2kg rock.
