Answer:
A -Added when in the same direction
     Subtracted when in opposite directions.
Explanation:
 
        
             
        
        
        
 Complete Question 
A 75 kg man and a 100. Kg woman are playing tug of war on a frictionless surface. The man accelerates toward the woman at 2.0 m/s2.How much force does she use to pull on the rope
Answer:
The value is  
Explanation:
From the question we are told that 
     The mass of the man is  
      The mass of the woman is   
 
      The acceleration of the man is  
Generally the force which she used to pull the rope is mathematically represented as  
            
=>         
=>         
 
        
             
        
        
        
Measurement tools make our lives safer and better? And they increase the quality and quantity of life. Arguably, the ability to measure calculating
 physical properties accurately have tremendous survival value that gives humans adaptive, evolutionary advantages sharpened through many years of natural selection.
 
        
             
        
        
        
Yes, Kinetic Energy is a scalar quantity because the direction is not needed.  A scalar quantity is one dimensional measurement.
Explanation:
- Kinetic Energy is a scalar quantity that means it has only a magnitude and no direction.
- Energy has a size but no direction; two objects can have the same kinetic energy but they travel in opposite directions.
- The formula of Kinetic Energy is
- K.E =  
- Mass is a scalar quantity and velocity is a vector quantity.
- squaring velocity will make vector to scalar quantity.