Brielle rubbed a plastic ruler on her hair. Her friend Maurice rubbed a beach ball on his shirt before placing it on a table. What will happen as Brielle slowly moves the ruler closer to the beach ball?

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)