physics
posted by brett herron on .
A plane is traveling at an altitude of 500meters and drops a bottle the bottle lands 400meters horizontally. how fast was the plane traveling when the bottle was released?

The bottle and the plane travel the same horizontal speed and distance
How long to fall 500 m?
500 = (1/2) 9.8 t^2
solve for t
How far in t seconds?
400 = v t
so
v = 400 / t