1. The problem statement, all variables and given/known data A stone is dropped from a balloon at an altitude of 300 metres. How much time is required for the stone to reach Earth if: (1) Balloon is ascending with a velocity of 5 m/s, (2) Balloon is descending with a velocity of 5 m/s (3) Balloon is stationary Disregard air resistance. 2. Relevant equations [itex] x=x_0+v_0t-1/2gt^2 [/itex] [itex] v=v_0-gt [/itex] 3. The attempt at a solution I have no problem with question 3 but I fail to understand how the ascend or descend of balloon affect the stone. I assumed that it affected the initial velocity of the stone but I can't seem to find the formula for time.