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The main force to take into account is air resistance, which increases with the square of velocity. When the balls are first dropped the air resistance increases. For the lighter ball there will come a point at which the increasing resistance due to its increasing speed exactly counteracts the force of gravity, so the ball will no longer accelerate but ...


If the loudness changes relatively quickly it's most likely wind. Sound waves travel relative to the fluid (air). If the fluid itself moves the shape of the waves changes relative to a stationary observer. Wind blowing towards you decreases the apparent distance since the wind speed adds to the speed of sound. Since the pressure falls with the inverse of ...

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