Physics isn't always a two-way street, and doesn't always play the same in forward and reverse, such as in this case. See the above posts for an explanation of what I'm saying. Formidilosus gave essentially the same explanation as I am.
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It's not always the same in forward and reverse but there is always a forward and reverse...
Aic
Well, no there's not. But in this case there is
And in this case, the reverse includes the rain drop pushing back on the air molecules, which are already behind the bullet as new molecules fill the pressure wave ahead....
