pilot of an airplane traveling at 160km/h wants to drop supplies to flood victims isolated on a patch of land?

Question

160m below. how many seconds before the plane is directly overhead should the supplies be dropped?

any one know how to solve this>

Answer 1

Yes, I can help you.
you only need to consider how long it would take for the supplies
to travel 160m to reach ground:
t = sqrt(2s/g) = sqrt(2*160/9.8) = 5.71(s)
That is the answer, which has nothing to do with the airplane speed.