A rope breaks when the speed of a 0.309 kg mass, moving in a circle of
radius 0.429 m, reaches 12.9 m/s.
How much tension is in the string when
it breaks?
(Unit = N)​

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)