Answer:
All are correct except the age of earth. The age of Earth is approximately 4.543 Billion Years.
 
        
             
        
        
        
Answer: (d)
Explanation:
Given
Mass of object 
Speed of object 
Mass of object at rest 
Suppose after collision, speed is v
conserving momentum

Initial kinetic energy 

Final kinetic energy

So, it is clear there is decrease in kinetic energy . Thus, energy decreases and velocity becomes 2 m/s.
 
        
             
        
        
        
When its temperature increases, the reactants have more kinetic energy so the frequency of effective collision increases, resulting in a faster rate of chemical reaction.
        
             
        
        
        
Explanation:
This is true because at maximum height, the velocity is 0
 
        
                    
             
        
        
        
The answer is the letter "C" ( I have honors science I am good at this type of stuff ) 
Hope I helped :) ( ask me for help when u need it :)