Answer:
 .
.
Explanation:
In a projectile motion, the kinetic energy (KE) of the projectile is converted to gravitational potential energy (GPE) and then from GPE back to KE.
In this example, the spring toy is the projectile. Refer to the diagram attached.
- The spring toy started with a velocity of  , meaning that its initial KE is non-zero. , meaning that its initial KE is non-zero.
- On the way up, the KE of this spring toy gets converted to GPE.
- At the top of the trajectory, the GPE of this toy is maximized while its KE is minimized (zero).
- As the toy returns to the ground, the GPE of this toy gets converted back to KE.
- The GPE of this toy is zero when the toy is on the ground.
In other words, the kinetic energy (KE) of this toy would be  when it is at the top of the trajectory and GPE is maximized.
 when it is at the top of the trajectory and GPE is maximized.
Since the KE of this toy at the top of the trajectory would be  , the velocity of this toy at that moment would also be
, the velocity of this toy at that moment would also be  .
.
 
        
             
        
        
        
The Majestic Aurora
Nature's Charming Rainbows 
Sunrise, Sunset, and Other Atmospheric Phenomena
Global Warming
Nature
        
             
        
        
        
Through radiation of the sun's rays. 
        
                    
             
        
        
        
Your Question:
<span>The
Solar System is made up of eight planets, numerous comets, asteroids,
and moons, and the Sun. The force that holds all of these objects
together is _______.
A. 
magnetism
B. 
tension
C. 
electromagnetic attraction
D. 
gravity
</span>
Our Teams Answer: 
the force is gravity holding them
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-ExperimentsDIY
 
        
        
        
The best answer is D. field lines should always be crossing each other.