Average speed = (total distance covered) / (total time to cover the distance) .
Total distance = (80 + 50 + 40) = 170 km
Total time = (1 + 0.5 + 0.5) = 2 hours
Average speed = (170 km) / (2 hrs) = 85 km/hr .
 
        
             
        
        
        
Answer:
Sounds cool.. but what do they do?
Explanation:
 
        
                    
             
        
        
        
Answer:
You drive 0.025 miles blind (or 132 ft)
Explanation: 
(distance) = (speed) x (time) 
(distance blind) = (speed) x (time looking for CD) 
(distance blind) = (45 mi/hr) x (2 s) x (1/3600 hr/s) = 0.025 miles = 132 ft
 
        
             
        
        
        
Answer: The electromagnetic waves reach Earth, while the mechanical waves do not. 
Explanation:
 
        
                    
             
        
        
        
The equal and opposite force is the force of the stone's gravity pulling up on thy Earth.
<u>Explanation</u>:
                                       
- When someone tosses a stone off a cliff, the force of gravity of Earth pulls down and the force of the stone's gravity pulls up on the Earth due to the equal and opposite reaction exerted between the Earth and the stone.
- In Newton's third law, two important features are present. One is the force exerted on two bodies will have the same magnitude but opposite direction. The other feature is force is acting on two different objects.
- This exerted force is equal in magnitude but opposite in direction whereas the gravity exerts a downward force on a stone and upward force on an Earth which is opposite in direction.