The sun has orbited along time so when they ask theses questions I give you the right answer I think lol
        
             
        
        
        
                   Time  =  (distance)  /  (speed)
                           =  (30 km)  /  (30 m/s)
                           =  (30,000 m)  /  (30 m/s)
                           =  (30,000 / 30)  sec
                           =      1,000 seconds
                           =      16 minutes  40 seconds   
        
             
        
        
        
Answer:
0.25 m. 
Explanation:
We'll begin by calculating the spring constant of the spring. 
From the diagram, we shall used any of the weight with the corresponding extention to determine the spring constant. This is illustrated below:
Force (F) = 0.1 N
Extention (e) = 0.125 m
Spring constant (K) =? 
F = Ke 
0.1 = K x 0.125
Divide both side by 0.125
K = 0.1/0.125
K = 0.8 N/m 
Therefore, the force constant, K of spring is 0.8 N/m
Now, we can obtain the number in gap 1 in the diagram above as follow:
Force (F) = 0.2 N
Spring constant (K) = 0.8 N/m 
Extention (e) =..? 
F = Ke
0.2 = 0.8 x e
Divide both side by 0.8
e = 0.2/0.8 
e = 0.25 m
Therefore, the number that will complete gap 1is 0.25 m. 
 
        
             
        
        
        
15) a 
16) b
17) a
Hope this helps
        
                    
             
        
        
        
I think it's C, three hues that are adjacent on the color wheel