which of the following is the longest distance A 5000 centimeters B 30 000 millimeters C 500 meters D 0.400 kilometers

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)