<span>D. price ceiling
</span><span>This is a government regulation that establishes a maximum price for a particular good.</span><span>
</span>
        
             
        
        
        
The answer is to the ground.
Gravity refers to the force that holds together the universe. On Earth, the gravity attempts to change the velocity of all the objects on the Earth's surface toward the ground at a rate of 9.8 meters per second squared according to Galileo. 
 
        
                    
             
        
        
        
Answer:
Explanation:
The greatest speed is attained at middle point or equilibrium point or where displacement from equilibrium point is zero . 
When the object remains at one of the extreme point it experiences greatest acceleration but at that point velocity is zero . Due to acceleration , its velocity goes on increasing till it come to equilibrium point . At this point acceleration becomes zero . After that its velocity starts decreasing because of negative acceleration . Hence at middle point velocity is maximum . 
The greatest acceleration is attained at maximum displacement or at one of the two extreme end . 
Greatest restoring force too will be at position where acceleration is maximum because acceleration is produced by restoring force . 
Restoring force is proportional to displacement or extension against restoring force . So it will be maximum when displacement is maximum .
Zero restoring force exists at equilibrium position or middle point or at point where displacement is zero . It is so because acceleration at that point is zero . 
 
        
             
        
        
        
As we know that friction force on box is given by

here we know that

here we have
m = 12 kg

so now we have

now we will have


so it required minimum 49 N(approx) force to move the block
 
        
                    
             
        
        
        
<h2>
Answer: Gravitational attraction will be the same</h2>
According to the law of universal gravitation, which is a classical physical law that describes the gravitational interaction between different bodies with mass:
 (1)
    (1)
Where:
 is the module of the force exerted between both bodies
 is the module of the force exerted between both bodies
 is the universal gravitation constant.
 is the universal gravitation constant.
 and
 and  are the masses of both bodies.
 are the masses of both bodies.
 is the distance between both bodies
 is the distance between both bodies
Now, if we double both masses and the distance also doubles, this means:
 and
 and  will be now
 will be now  and
 and 
 will be now
 will be now  
 
Let's rewrite the equation (1) with this new values:
 (2)
    (2)
Solving and simplifying:
 
    
 (3)
     (3)
As we can see, equation (3) is the same as equation (1).
So, if the masses both double and the distance also doubles the <u>Gravitational attraction between both masses will remain the same.</u>