The answer is false. The speed of the astronaut cancels out the force of gravity, causing a 'stationary freefall'. While under these effects, it is not required for an astronaut to 'strengthen' his body.
        
                    
             
        
        
        
Explanation:
Below is an attachment containing the solution. 
 
        
             
        
        
        
The kinetic energy would be 53,775J:)
        
             
        
        
        
Answer:
the changes in waves
Explanation:
the moon has its own gravitational pull thus making waves  and the rising tides