Answer:
1995 and 2000 , 4 trillions 
Explanation:
 
        
                    
             
        
        
        
Answer:
15 cm
Explanation:
 = Diameter of the coin = 15 mm
 = Diameter of the coin = 15 mm 
 = Diameter of the image of coin =  5 mm
 = Diameter of the image of coin =  5 mm 
 = distance of the coin from mirror = 15 cm
 = distance of the coin from mirror = 15 cm 
 = distance of the image of coin from mirror = ?
 = distance of the image of coin from mirror = ?
Using the equation 


 = - 5 cm
 = - 5 cm 
 = radius of curvature
 = radius of curvature 
Using the mirror equation 


 = - 15 cm
 = - 15 cm 
 
        
             
        
        
        
The mass of the object will remain the same rather it's on the moon or on the Earth and even in other places. But the weight will change on the moon, so its weight will be different from the one it had on Earth
        
             
        
        
        
Answer with Explanation:
We are given that 
Initial velocity,u=4.5 m/s
Time=t =0.5 s
Final velocity=v=0m/s
We have to find the deceleration and estimate the force exerted by wall on you.
We know that 
Acceleration=
Using the formula 
Acceleration=
deceleration=a=
We know that 
Force =ma
Using the formula and suppose mass  of my body=m=40 kg
The force exerted by wall on you
Force=
 
        
             
        
        
        
Answer:
As the sound approaches, it gets louder (simply because you're closer to the source), and has a higher pitch. Then, as it passes, the sound suddenly dips down, and as it drives away you hear a lower pitch, plus a decreasing volume as the engine gets farther and farther away. 
Explanation: