Franz Mesmer believed that his ability to heal people was based on his manipulation of which force? A. Electricity B. Gravity C. Magnetism D. Inertia.

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)