I think the correct answer is potential energy since an object at rest store energy as a result of its position and is called us such. For instance, a book placed in a table is storing energy as it held at an elevated position.
        
             
        
        
        
The ball's potential energy will decrease, and its kinetic energy will increase.
Explanation:
The ball's potential energy will decrease down the slope and its kinetic energy will increase. 
Kinetic energy is the energy due to the motion of a body. 
  K. E =  m v²
 m v²
  m is the mass of the ball 
   v is the velocity of the ball. 
Potential energy is the energy due to the motion of a body down slope. 
 It is expressed as: 
    P.E = mgh 
   m is the mass of ball
    g is the acceleration due to gravity of the body
   h is the height. 
We can see as the body drops down the slope, the height diminishes and the velocity increases. 
learn more: 
Potential energy brainly.com/question/10770261
#learnwithBrainly
 
        
             
        
        
        
Protons: 7
electrons: 7
neutrons: 7
        
                    
             
        
        
        
Answer:
It is a sample of matter with both constant and definite composition 
Explanation: