Work is done when spring is extended or compressed. Elastic potential energy is stored in the spring. Provided inelastic deformation has not happened, the work done is equal to the elastic potential energy stored.
 
        
                    
             
        
        
        
V=(40km/hr)(hr/3600s)(1000000mm/km)
v=11111.1mm/s 
v=d/t
d=vt 
d=(11111.1mm/s)(5s)
d=55555mm
d=5.56x10^4mm
        
             
        
        
        
Answer:
1350N
Explanation:
Weight = Mass x Acceleration Due to Gravity
W=mg
W=90*15=1350N
 
        
             
        
        
        
Just divide the both, you will get the answer!
does it sound rude?
im sorry for that!
 
        
             
        
        
        
Answer:
i think that the awnsre is d