To add vectors we can use the head to tail method (Figure 1).
Place the tail of one vector at the tip of the other vector.
Draw an arrow from the tail of the first vector to the tip of the second vector. This new vector is the sum of the first two vectors.
        
             
        
        
        
The answer is D using the work formula 
W= F•d but if it was against gravity, it would be 0 if gravity is exerting the same amount, I would pick D using the formula, but I'm not so sure sorry
        
             
        
        
        
2,450 Joules,  kinetic energy is 1/2 mass x velocity squared. 
        
             
        
        
        
Answer:
Same weight so neither is heavier
 
        
                    
             
        
        
        
The solution is 'supersaturated' ... holding more solute than it's supposed to be able to hold.