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A small bag of sand is released from an ascending hot‑air balloon whose constant, upward velocity...

A small bag of sand is released from an ascending hot‑air balloon whose constant, upward velocity is ?0=2.05 m/sv0=2.05 m/s. Knowing that at the time of the release the balloon was 81.8 m81.8 m above the ground, determine the time ?τ it takes for the bag to reach the ground from the moment of its release. Use ?=9.81 m/s2.

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