The force pulling the moon toward earth depends on the mass of the two bodies and which factor? a. the distance between them b. the size of their orbits around the sun c. the location of their centers of mass d. the speed they travel

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)