Watch motion in 1 D video, where similar concept is discussed, and send us your attempted solution
as we know the air balooon starts from rest henece
, S=1/2gt^2
as here g/8 (given)
S=1/2*g/8*t^2
i.e S=g/16*t^2
from here you can calculate t easily
option (a) is correct
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