Answer:
The final velocity is 31.86 m/s.
Explanation:
The final velocity can be found using the following equation:

Where:
 is the final velocity =?
 is the final velocity =?
 is the initial velocity = 33.9 m/s
 is the initial velocity = 33.9 m/s
a is the acceleration = -2.02 m/s²
t is the time = 1.01 s

Therefore, the final velocity is 31.86 m/s.
I hope it helps you!
 
        
             
        
        
        
Answer:
The mass is  
Explanation:
From the question we are told that 
      The initial temperature is  
       The final  temperature is  
 Generally the maximum heat produced by  1  Liter   of  natural gas is   
 
  So the amount of heat produced by 100 L is  
               
=>           
Generally given that the efficiency is  
Then actual heat received by the water is
          
=> 
=>  
 
Converting to kcal  
=> 
 Generally the specific heat of water is  
        
Generally the heat received by the water is mathematically represented as 
        
=>     
=>     
      
 
        
             
        
        
        
Wavelength is defined as distance between two troughs or two crests !!
so in this wavelength is 4 metres !!
        
                    
             
        
        
        
Explanation:
distance between both objects and masses of the objects