9.8m per seccond is the speed of gravity if you drop something like a ball from a tower
Is there more information ?
D.6.22N. because .42kg * 14.8m/s=6.22 N[meaning newtons}.
Answer:
The value is
Explanation:
From the question we are told that
The length of the crack is
The frequency is
The distance outside the cave that is being consider is
The speed of sound is 
Generally the wavelength of the wave is mathematically represented as

=> 
=> 
Generally for a single slit the path difference between the interference patterns of the sound wave and the center is mathematically represented as

=> 
=> 
Generally the width of the sound beam is mathematically represented as

=> 
=>
It will be traveling in the reverse direction it was originally going at 15.2 m/s