A or possibly C because the other options have nothing to do with the size of the vibration. If i was you I would answer with A
        
             
        
        
        
<span>The formula for frequency is speed of light divided by wavelength. 650 nm represents the wavelength and 3x10^8 m/s is the speed of light. If you convert 650nm to meters you get 6.5x10^-7 m so you can divide using the formula above, giving you 4.6x10^14 1/s or Hz, the unit of frequency in Physics.</span>
        
             
        
        
        
Density = mass / volume
D = 89 / 10.0
D = 8.9 g/cm³
hope this helps!
        
             
        
        
        
Answer:
D
D
C
C
Explanation: BRAINLIEST ME
 
        
             
        
        
        
I would say the answer is D: The force of the cyclist and the force of the bicycle add together increasing downhill acceleration.
Hope this helps