<span>As the marble leaves the table at two different speeds, its
horizontal velocity changes, but its vertical velocity does not.</span>
I belive that they are undalanced
A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
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