D is the answer i think it is at least
        
             
        
        
        
First:
F=m.a
=4*7
=28N
Second:
F=m.a
28=m.2. (force is constant,so F=28N)
28/2=m
m=14kg.
 
        
                    
             
        
        
        
Where the line segment A starts is home
        
             
        
        
        
Answer:
1/3
Step-by-step explanation:
2/6=1/3
 
        
             
        
        
        
Average speed =   (distance final - distance initial)/(time final - time initial)
Average speed = (30-0)km /(100 -0)min = 3/10 km/min
3/10 km/min *60 min/1 h = 180/10 km/h= 18 km/h