When you're in an airplane that's 7 miles up off the ground, the strength of gravity plunges to only 99.6 percent of its strength all the way down on the ground.
A big heavy person, who weighs 200 pounds down at the airport, weighs only 199 pounds 4.7 ounces in a plane at the altitude of 7 miles.
        
             
        
        
        
It mainly travels by kinetic energy
        
                    
             
        
        
        
Explanation:
Below is an attachment containing the solution. 
 
        
             
        
        
        
Given parameters: 
Displacement = 8km
Velocity  = 3.8km/h
Unknown:
time  = ? 
Solution: 
Velocity is displacement divided by time. 
   Velocity  =  
  
       Displacement  = velocity x time
Input the parameters: 
               8  = 3.8  x time
  Time  =  = 2.1s
   = 2.1s
The time taken is 2.1s
 
        
             
        
        
        
Answer:
B. - 0.328
Explanation
Potential Energy:<em> This is the energy of a body due to position.</em>
<em>The S.I unit of potential energy is Joules (J).</em>
<em>It can be expressed mathematically as</em>
<em>Ep = mgh........................... Equation 1</em>
<em>Where Ep = potential energy, m = mass of the coin, h = height, g = acceleration due to gravity,</em>
<em>Given: m = 2.74 g = 0.00274 kg, h = 12.2 m, g = 9.8 m/s²</em>
Substituting these values into equation 1
Ep = 0.00274×12.2×9.8
Ep = 0.328 J.
Note: Since the potential energy at the surface is zero, the potential Energy with respect to the surface = -0.328 J
The right option is B. - 0.328
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