Answer:
The force will be "5,488". A further solution is provided below.
Explanation:
The given values are:
speed,
v = 100m/s
mass,
m = 80 kg
acceleration,
a = 7
Now,
Radius will be:
⇒ 
⇒ 
⇒ 
⇒ 
Force will be:
⇒ 
⇒ 
⇒ 
I think that your answer would be the third option
It will increase..........................
Answer:

Explanation:
When she moved a distance of 1 m from mid point she observe first destructive interference due to two speakers
so we can say that path difference of sound due to two speakers will be equal to half of the wavelength
so path difference is given as

so it will be


now we know that


now frequency of sound is given as


