Answer:
3.2 m
Explanation:
The equation to use to solve this problem is:

where
 is the final velocity
 is the final velocity
 is the initial velocity
 is the initial velocity
a is the acceleration
 is the distance covered
 is the distance covered
For the particle in free-fall in this problem, we have
 (it starts from rest)
 (it starts from rest)

 (acceleration due to gravity)
 (acceleration due to gravity)
By re-arranging the equation, we can find the distance travelled:

 
        
             
        
        
        
Answer:
D. High frequency and short wavelengths.
Explanation:
If a wave is high in energy it will have a higher frequency. 
High frequency = short wavelengths
 
        
             
        
        
        
The answer is C in this question.
        
                    
             
        
        
        
Answer:
heat energy is used in boiling water and to make steam at power stations
Explanation: