Object a and object b are 100 meters apart. if object a gains some
mass, how does that affect the gravitational force between the two objects?
o a) it increases.
ob) it decreases.
oc) it remains the same.

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)