a plane moving horizontally at 120 m/s drops a package from an elevation of 240 m. How far did the package go before it hit the ground?

Step by step directions please!

2 answers

How long was it falling?
It fell 240 m with no initial vertical velocity
a = -g = -9.8 m/s^2
Vo = 0
Zo = 240 m
Zfinal = 0 m
so
0 = 240 + 0 - (1/2)(9.8) t^2
4.9 t^2 = 240
t = 7 seconds in the air
NOW
there are no horizontal forces on it so it keeps going ahead at 120 m/s for the 7 seconds, moving 840 m horizontal.

By the way unless it turned or changed speed, the plane also moved 840 m during the 7 seconds and the bomb burst right under the plane. It is best to turn and ascend after dropping a bomb.
thank you!!
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