According to the kinetic theory of gas particles, when do gas particles have some type of force between them? When the volume increases
When the gas particles collide
When the pressure on the gas particles decreases
When the temperature increases

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)