Because the sun stays in the same place but your brain makes you think the sun is descending so your eyes think you're higher than the sun
        
             
        
        
        
<span> Beryllium has an exclusive </span>+2<span> oxidation state in all of its compounds</span>
        
             
        
        
        
Spring C stretches 100 cm.
Explanation:
The spring constant is simply the stiffness of the spring. The higher the spring constant the more stiff the spring is. 
Spring constant shows the force needed to stretch a spring from it's equilibrium position. If a material requires more force to cause it to stretch, it will have a high spring constant. 
           According to hooke's law "the force needed to extended an elastic material is directly proportional to its extension"
           F = ke 
    k is the spring constant
    e is the extension
We see that the spring that stretches by 100 is the less stiff compared to other springs. It has the smallest spring constant. 
Learn more; 
Force brainly.com/question/8882476
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Answer:
Expression of work done is

Work done to move the sled is given as 187.2 J
Explanation:
As we know that the formula of work done is given as

here we know that
F = 12.6 N
d = 15.4 m

so we will have

