Velocity, unlike speed, includes a direction.
Velocity is a vector quantity which is defined by magnitude and direction.
Speed is a scalar quantity. It is the rate at which an object moves regardless of which direction.
 
        
                    
             
        
        
        
Salt is a substance because a substance is a material that has constant composition regardless of its source. Salt is the only option that matches this description
        
             
        
        
        
Thiết bị không phải nguồn điện: 
Đáp án D
 
        
             
        
        
        
Answer:
kinetic energy
Explanation:
A wind turbine transforms the mechanical energy of wind into electrical energy. A turbine takes the kinetic energy of a moving fluid, air in this case, and converts it to a rotary motion. As wind moves past the blades of a wind turbine, it moves or rotates the blades. These blades turn a generator