A body can move in a circle at constant speed if A. net radial forces equal net tangential forces. B. there is an unbalanced radial force directed inwards. C. all the statements above are correct. D. inward and outward forces are equal in magnitude. E. none of the statements above are correct.

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)