Answer:
<u>Acceleration</u> is the rate of change of velocity of an object.
Formula: Had to take a picture of the formula
 
        
                    
             
        
        
        
frequency is equal to number of oscillations or vibrations upon time
therefore, 
check picture
 
        
             
        
        
        
Answer:
Approximately  (assuming that the projectile was launched at angle of
 (assuming that the projectile was launched at angle of  above the horizon.)
 above the horizon.)
Explanation:
Initial vertical component of velocity:
 .
.
The question assumed that there is no drag on this projectile. Additionally, the altitude of this projectile just before landing  is the same as the altitude
 is the same as the altitude  at which this projectile was launched:
 at which this projectile was launched:  .
.
Hence, the initial vertical velocity of this projectile would be the exact opposite of the vertical velocity of this projectile right before landing. Since the initial vertical velocity is  (upwards,) the vertical velocity right before landing would be
 (upwards,) the vertical velocity right before landing would be  (downwards.) The change in vertical velocity is:
 (downwards.) The change in vertical velocity is:
 .
.
Since there is no drag on this projectile, the vertical acceleration of this projectile would be  . In other words,
. In other words,  .
.
Hence, the time it takes to achieve a (vertical) velocity change of  would be:
 would be:
 .
.
Hence, this projectile would be in the air for approximately  .
.
 
        
                    
             
        
        
        
Answer:
Immediate, potential
Explanation:
In america there are many safety council .in which drivers are trained. According to american safety council in america the drivers are trained in such a way that they can ahead two seconds so that there will not be any immediate hazards and 10 to 12 seconds down the road for potential hazards 
So in the blanks there will be immediate and potential