Because it is physically true day really know that by just knowing it very well
        
             
        
        
        
Answer:
9 joules of heat energy was produced 
Explanation: there is no acceleration therefore its not a kinetic energy 
Energy= force × distance 
= 3×3
=9
 
        
             
        
        
        
Answer:
Option (2)
Explanation:
From the figure attached,
Horizontal component, 
![A_x=12[\text{Sin}(37)]](https://tex.z-dn.net/?f=A_x%3D12%5B%5Ctext%7BSin%7D%2837%29%5D)
      = 7.22 m
Vertical component, ![A_y=A[\text{Cos}(37)]](https://tex.z-dn.net/?f=A_y%3DA%5B%5Ctext%7BCos%7D%2837%29%5D)
     = 9.58 m
Similarly, Horizontal component of vector C,
 = C[Cos(60)]
  = C[Cos(60)]
      = 6[Cos(60)]
      = 
      = 3 m
![C_y=6[\text{Sin}(60)]](https://tex.z-dn.net/?f=C_y%3D6%5B%5Ctext%7BSin%7D%2860%29%5D)
     = 5.20 m
Resultant Horizontal component of the vectors A + C,
 m
 m
 = 4.38 m
 = 4.38 m
Now magnitude of the resultant will be,
From ΔOBC,

    = 
    = 
    = 6.1 m
Direction of the resultant will be towards vector A. 
tan(∠COB) = 
                   = 
                   = 
m∠COB = 
              = 46°
Therefore, magnitude of the resultant vector will be 6.1 m and direction will be 46°.
Option (2) will be the answer.
 
        
             
        
        
        
Answer:
c line of credit I believe