A hot-air balloon is released from rest and rises up with

Question

Compute all parts of given problem:

Problem: A hot-air balloon is released from rest and rises up with an acceleration of magnitude g/4 (i.e., 2.45 m/s²).

Part A: When does the balloon reach a height of 28.0 m?

Part B: How fast is the balloon moving at that time?

Part C: At this time, a sandbag is dropped from the balloon. What is the maximum height above the ground reached by the bag?

Part D: How long after being released does the bag reach the ground?

Part E: What is the height of the balloon above the ground when the bag reaches the ground?

I need the right answer and steps of solving this problem. Thanks!