Explanation:
Starting position at x  = 16m 
Ending position at x  = -25m 
Time of flight  = 4s 
Unknown: 
Distance flown  = ? 
Displacement  = ? 
Speed  = ? 
Velocity  = ? 
Solution: 
To find the distance flown, we should understand that the body is moving on the x - plane;  
   So distance  = 16 + 25  = 41m 
Displacement is 41m to the left or -x axis 
Speed is the distance divided by the time taken; 
       Speed  =  =
   =  = 10.25m/s
   = 10.25m/s 
Velocity is 10.25m/s along -x axis
 
        
             
        
        
        
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Physical change = changes the physical properties (more commonly known as it's look)
Chemical change = changes the chemical properties into an entire new chemical form
Examples of physical change would be melting ice cubes or sugar cubes.
Examples of chemical change would be cooking eggs or burning paper because you're changing its chemical properties.
        
             
        
        
        
Answer:
20m/s due east
Explanation:
Given parameters: 
Displacement eastward  = 200m 
Time  = 10s 
Unknown: 
Velocity  = ? 
Solution: 
Velocity is the displacement divided by time; 
     Velocity  =  
   
  Velocity  =  = 20m/s due east
    = 20m/s due east
 
        
             
        
        
        
Answer:
The total number of electrons is 
(3) is correct option.
Explanation:
Given that,
The current equation is

We know that,
The formula of charge








We need to calculate the number of electron
Using formula of charge




Hence, The total number of electrons is 