If you push on the sides of a filled balloon, how does the gas pressure inside the balloon change?

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For the bullet,  the net force on the bullet: an fbd would look like a dot with a horizontal "friction" force protruding from one end.by newton's 2nd law: we can solve for acceleration since we know  and .we know that  (final velocity is bullet not moving), . we can use the following kinematic equation to get  , or the displacement.so it penetrates  m.