Answer: The average velocity is 150 km/h 
Explanation: 70+80=150
 
        
             
        
        
        
Answer:
500J
Explanation:
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Answer:
Option B
Explanation:
Speed of a wave is denoted by:
v=fλ
where f is the frequency which is unchanged 15Hz and λ is the new wavelength which is 28m
v=fλ

 
        
                    
             
        
        
        
Answer:
hi, the reason is for friction so that they don't fall. subscribe to me on you tube. name is my brainly name
Explanation: