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
 
        
                    
             
        
        
        
Hi there!
Recall Newton's Second Law:

∑F = net force (N)
m = mass (kg)
a = acceleration (m/s²)
We must begin by solving for the acceleration using the following:
a = Δv/t 
In this instance:
Δv = 3 m/s
t = 2.5 sec
a = 3/2.5 = 1.2 m/s²
Now, plug this value along with the mass into the equation for net force:

 
        
                    
             
        
        
        
They correspond due to the fact that certain elements are grouped together based on the number of valence electrons on the outer shell of their electron configuration. 
For instance, sulfur (S) has 6 electrons in the outer shell, as it is in the 6th group EXCLUDING transition metals (note, never take these into account, as their charge is always +2; a cation)
        
             
        
        
        
D is the answer because your body can do that in all the 7 location where the heat goes in your body in 2,3, OR 5-6 days