Question

Can someone help me to understand how to work out this problem?

The pilot of an airplane traveling 240 km/h wants to drop supplies to flood victims isolated on a patch of land 160 m below. The supplies should be dropped how many seconds before the plane is directly overhead?
bobpursley
how long does it take an object to fall 160 m?
Bobpursley -- I do not understand. The answer was 5.7 s and I have no idea what equation was used to get that.
y = .5gt^2

160 = .5gt^2

= 5.71s

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