01:39:21 2011
Newton's third law of motion says that for every action there is a(n)
and opposite reaction.
do
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Newton’s third law of motion

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)