Answer:
7.644 feet
Explanation:
Free fall means that an object is falling freely with no forces acting upon it except gravity, a defined constant, g = -9.8 m/s2. The distance the object falls, or height, h, is 1/2 gravity x the square of the time falling. 
 
        
             
        
        
        
Answer:
its not moving at a constant velocity because it is slowing down
Explanation:
 
        
                    
             
        
        
        
True. Electromagnetic energy does not require a medium.
 
        
                    
             
        
        
        
Answer:
The right solution is "165.8 nm".
Explanation:
Given:
Index of refraction,
n = 1.81
Wavelength,
λ = 600 nm
We know that,
⇒ 
By putting the values, we get
       
       