Newton's first law of motion states that when there is no net external force, an object will remain at rest or travel with a constant velocity. 
When an object is moving, there is a force of friction resisting the motion, and slowing it down. To maintain a constant velocity, a person must push with a force equal to that of friction, to counteract the frictional force. 
Since the pushing force cancels the friction force out, there is no net external force, and so the object moves at a constant velocity
Hope I helped! xx
P.S.: Think this question is more suited to be asked under the "Physics" section
        
             
        
        
        
The answer is c because the precession of the ecliptic was component of a milankovitch cycle  and is related to periodic ice ages through out history
 
        
                    
             
        
        
        
Hey there!
There are two genders known to science, male and female. People nowadays have the ability to alter their gender, but in the end, there are really only two.
I hope this helps!
 
        
                    
             
        
        
        
The main reason for this activity is the activation energy needs to be overcome in the reaction.
<h3>What do you mean by Dehydration?</h3>
Dehydration may be defined as a process where there is a removal or loss of water takes place from something. 
When the reaction between sucrose and and sulfuric acid is carried, it may leads to dehydration of sucrose. As a result of this, activation energy requires to come up in the reaction. 
Therefore, the main reason for this activity is the activation energy needs to be overcome in the reaction.
To learn more about the activation energy, refer to the link:
brainly.com/question/24749252