a ball is thrown vertically upward with a velocity v w.r.t ground from the ballon decending with velocity v the ball will pass by the ballon after time

Relative speed of the ball w.r.t balloon = u + v Time taken by ball to reach the higest point is t

0 = -(u+v)+gt

Therefore, t=(u+v)/g

Total time = 2t = (2u+2v)/g

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