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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.
Vertebrate is the answer I think.
Answer:
Acceleration
When we cross multiply, distance will be equal to acceleration multiply by time
Distance = acceleration x time
Distance = 9.8 x 3
= 29.4 m/s