3. It is not changing at that time
Explanation:
If the acceleration of a body is zero at some instant in time, it implies that the velocity is not changing at that point in time. Velocity is the rate of change of displacement with time.
✓Acceleration and velocity shares a very close relationship.
✓ For a body to accelerate, the velocity must change. Acceleration is defined as the rate of change of velocity with time.
✓If at any point, a body moves with constant velocity i.e the velocity does not change with time, the acceleration becomes zero. 
✓ For acceleration to occur, a body must change velocity.
Learn more:
Acceleration brainly.com/question/6323625
#learnwithBrainly
 
        
             
        
        
        
Hello!
Mass, a weight. 
Gravity, force. 
Translated the Turkish.
Kütle, bir ağırlıktır.
Yer çekimi, insanın yere uyguladığı kuvvet.
Answer (Turkish : Cevap)
True (Doğru)
Have a nice day! ( İyi günler!)
 
        
                    
             
        
        
        
<h2>Potential energy lost by 10 N rock will be greater</h2>
Explanation:
Two rocks of 5N and 10N falls from the same height . Thus they will loose the potential energy.
The potential energy lost = mass x acceleration due to gravity x height
The potential energy lost by first 5 N rock = 5 h 
Because weight of rock m g = 5 N 
Similarly , the potential energy lost by 10 N Rock = 10 h 
here weight of rock m g = 10 N
Thus comparing these two , the potential energy lost by 10 N rock is greater than that of 5 N rock .
 
        
             
        
        
        
A star's temperature is most likely indicated by the color of it. The hotter the star, the bluer it is. The colder the star, the redder it is.