Military personnel also use periscopes in some gun turrets and in armoured vehicles. More complex periscopes using prisms or advanced fibre optics instead of mirrors and providing magnification operate on submarines and in various fields of science
 
        
             
        
        
        
Letter D: The amount of sleep a student gets affects student achievement
        
                    
             
        
        
        
It doesn't matter what the object's initial velocity is, or how long 
the acceleration lasts.  All that matters is the object's mass and 
acceleration.
Force = (mass) x (acceleration) = 
                (5kg) x (15 m/s²) = 
                         75 kg-m/s² = <em>75 newtons .</em>
        
             
        
        
        
Answer:
Evidence for continental drift
Wegener knew that fossil plants and animals such as mesosaurs, a freshwater reptile found only South America and Africa during the Permian period, could be found on many continents. He also matched up rocks on either side of the Atlantic Ocean like puzzle pieces.
Explanation: