how to grasp this problem?

[asim_569]

this question is from book of PHYSICS by HALIDAY /RESNICK
i could not find its answer please give me your comments
thanks
what is the downward acceleration of and projectile that is released from missile accelerating upward at 9.8m/s*2
Q#2
On another planet the value of g is one half the value of g on earth how much time is needed for an object to fall from rest position on ground on the planet related to time on earth . i assumed the distance is equal

[Heisenberg]

Once it is released the only external forcer acting upon the missile in gravity. Hence this is a tricky but easy question- g

#2

d=1/4*g*t^2

t=2*sqrt(d/g)

t=t(earth)*sqrt(2)