Answer:
a)  , b)
, b)  , c)
, c) 
Explanation:
a) The change in the gravitational potential energy of the marble-Earth system is:


b) The change in the elastic potential energy of the spring is equal to the change in the gravitational potential energy, then:

c) The spring constant of the gun is:




 
        
             
        
        
        
force times gravity (FG) =mass times gravity (mg) 
 
        
             
        
        
        
Answer:
True
Explanation:
Solids, Liquids, and Gases are all make up of <u><em>atoms and molecules. </em></u>
 
        
             
        
        
        
Answer:
72.1 m
Explanation:
Hello!
When the walker walks west, each block he walks will be of 100 m, so the walker walked 4*100m = 400 m west.
Similarly, when the walker walks south, he walks 20 meters per block, therefore, the walker walked 4*20 m = 80 m south.
Since the directions west and south are perpendicular, the distance between the start ad end point is:
d = √(400^2 + 80^2) m = 407.92 m
However the walker traveled 480 m
Therefore, the walker traveled 480 - 407.9 m = 72.1 m farther than the actual distance
 
        
             
        
        
        
Type	motion	examples and subtypes
electromagnetic radiation	disturbance propagating through electric and magnetic fields (classical physics) or the motion of photons (modern physics)	radio waves, microwaves, infrared, light, ultraviolet, x-rays, gamma rays
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