Answer
Displacement of balloon above ground at any tine t
$Yb = 12m +Vb*t$
Vb=velocity of balloon
For pellet
$ Yp = V0*t + 1/2g*t^2$
for time t
Yb = Yp
putting values
t= 4.09 sec and 0.602 sec
Work Step by Step
For t =4.09 sec
Yb(Height of balloon) = 41 m
for t = 0.602 sec
Yb (height of balloon)=16m
