Answer:
D. electromagnetic forces
Explanation:
 
        
                    
             
        
        
        
Answer:
The velocity of the police car relative to earth is 
 
Given:
time for flash generation of the inter galactic police car, t = 1.2 s
time between flashes as measured from earth, t' = 2.2 s
Solution:
Utilising Einstein's equation for time dilation to calculate the velocity of the police car, the equation is given by:
                                (1)
where, c = speed of light in vacuum = 
re arranging eqn (1) for velocity, v:
                               (2)
Now, from eqn (2)


 
 
        
             
        
        
        
The answer is *drum roll* tides