If by chance you mean any wave, the wave with the shortest wavelength/highest frequency is gamma rays.
        
             
        
        
        
Answer:
30 m/s
Explanation:
Speed is distance over time. 60 meters / 2 seconds, = 30 m/s. 
 
        
             
        
        
        
The first step of the scientific method is to MAKE OBSERVATIONS
        
             
        
        
        
Answer:
The total momentum is  
Explanation:
The diagram illustration this  system is shown on the first uploaded image (From physics animation)
From the question we are told that 
      The mass of the first object is 
       The speed of the first mass is 
       The mass of the second object is  
       The speed of the second object is  assumed to be  
 The total momentum of the system is the combined momentum of both object which is mathematically represented as 
            
    substituting values 
             
             