120n 
since the speed is doubled, her force is doubled
 
        
             
        
        
        
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Answer:
0.68 m
Explanation:
We know that the speed of sound in air is a product of frequency and wavelength. Taking speed of sound in air as 340 m/s
V=frequency*wavelength
Then wavelength is given by 350/500=0.68 m
Therefore, to repeat constructive interference at the listener's ear, a distance of 0.68 m is needed
 
        
             
        
        
        
We don't know Carter, and we don't know where he is or what 
he's doing, so I'm taking a big chance speculating on an answer.
I'm going to say that if Carter is pretty much just standing there, 
or, let's say, lying on the ground taking a nap, then the force of 
the ground acting on him is precisely exactly equal to his weight.