Answer:
Explanation:
We shall first calculate the velocity at height h = 575 m .
acceleration a = 2.2 m /s²
v² = u² + 2 a s 
u is initial velocity , v is final velocity , s is height achieved 
v² = 0 + 2 x 2.2 x 575 
v = 50.3 m /s 
After 575 m , rocket moves under free fall so g will act on it downwards 
If it travels further by height H 
from the relation 
v² = u² - 2 g H 
v = 0 , u = 50.3 m /s 
H = ?
0 = 50.3² - 2 x 9.8 H 
H = 129.08 m 
Total height attained by rocket 
= 575 + 129.08 
= 704.08 m .
 
        
             
        
        
        
A large force is required to accelerate the mass of the bicycle and rider. Once the desired constant velocity is reached, a much smaller force is sufficient to overcome the ever-present frictional forces. 
        
             
        
        
        
Answer:
molecules of elements
Explanation:
An element is formed of one type of atoms. An element is a pure substance. A compound is formed of atoms of different elements chemically combined together in fixed ratio. A molecule of compound has different type of atoms chemically combined. For example, a water molecule is of compound having 2 hydrogen atoms and 1 oxygen atom. A molecule of element has same type of atoms chemically combined.  For example oxygen O₂ is a molecule of element. 
In the given diagram, same atoms are chemically combined. Thus, these represent molecules of elements. 
 
        
                    
             
        
        
        
<span>A decrease in the overall volume of gases namely hydrogen would prevent nuclear fusion in a nebula.</span>