Total mechanical energy = kinetic energy + potential energy
E = KE + PE
E = ½mv² + mgh
E = ½(0.1 kg)(2 m/s)² + (0.1 kg)(9.8 m/s²)(1.5 m)
E = 0.2 J + 1.47 J
E = 1.67 J
        
                    
             
        
        
        
Answer:
The correct answer to the question is
B. It always decreases
Explanation:
To solve the question, we note that the foce of gravity is given by
 where
 where 
G= Gravitational constant
m₁ = mass of first object
m₂ = mass of second object
r = the distance between both objects
If the mass of one object remains unchanged while the distance to the second object and the second object’s mass are both doubled, we have
 =
 = 
Therefore the gravitational force is halved. That is it will always decrease
 
        
             
        
        
        
Answer: 14.7kJ, 29.4kJ, 44.1kJ
Explanation:
<em>The gravitational potential energy is the energy that a body or object possesses, due to its position in a gravitational field.  </em>
<em />
In the case of the Earth, in which the gravitational field is considered constant, the value of the gravitational potential energy  will be:
 will be:  
 
  
Where  is the mass of the object,
 is the mass of the object,  the acceleration due gravity and
 the acceleration due gravity and  the height of the object.
 the height of the object.  
Knowing this, let's begin with the calculaations:
For m=3kg
 
  
 
  
For m=6kg
 
  
 
  
For m=9kg
 
  
