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Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)
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A train takes 2.5 hours to travel 120 kilometers. What is the train's average speed?
A: 0.02 hr/km<...
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