How do elements form? a) through fusion in stars and supernova b)through the cooling of molten lava c)through the evaporation of seawater d)through chemical reactions

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)