Answer:
Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Here are some differences: Sound can only travel through a medium (substance) while light can travel through empty space.
 
        
             
        
        
        
Answer:
Option (D) : The object slows down.
 
        
             
        
        
        
So the result is not biased or affected in some way
 
        
             
        
        
        
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The potential energy of the object depends on 
- the height of the object with respect to some reference points,
-  the mass of the object,
- the gravitational field the object is in. 
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Hope it helps ~
 
        
                    
             
        
        
        
Answer:
32000joule.
Explanation:
given
mass. (m)=160kg
speed (v)=20m/s
now 
kinetic energy =1/2 (mv²)=1/2 ×{160×20²}=32000joule.