Answer:
An outside force
Explanation:
Newton's law an object in motion stays in motion an object at rest stays at rest unless acted on by an outside force.
 
        
             
        
        
        
Answer:
D. 2.5 Hz
Explanation:
Frequency = speed of wave / wavelength
 = 335 /140 ( from graph)
 = 2.4
 
        
             
        
        
        
Answer:
A 
Explanation:
the metal lunchbox has a higher conductivity 
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Answer:
I actually have 20000 arena points thank you very much
 
        
                    
             
        
        
        
Displacement is d  
Vf² = Vi² + 2 g d  
(-20²) = (+10²) + 2 (-9.8) d  
-19.6 d = 300  
d = -15.3 m  
negative means lower
time is t  
d = Vi t + 1/2 g t²
-15.3 = 10 t + (-4.9) t²
4.9 t² - 10 t -15.3 = 0  
t = 3.06 s
Hope this helps -John