Explanation:
The table is level and there are no other forces on the book, so the normal force is equal to the weight.
N = mg
N = (2.3 kg) (9.8 m/s²)
N = 22.5 N
 
        
                    
             
        
        
        
The balloon was 30.65 meters above ground.
ANSWER: A
        
                    
             
        
        
        
There would be no mass or weight and he would float away
        
                    
             
        
        
        
Its true the ionic compounds have a higher melting point