A plane is flying 120 m above the ground at an angle of 30 degrees to the horizontal, when the pilot released 2 fuel tanks to decrease the planes load. How long did the tanks fall and with what speed did it hit the ground of the plane's speed was 84 m/s?

Explanation:

1. Fall time

i) Find the vertical speed of the plane when the tanks were released

That is the same initial vertical speed of the tanks.

ii) Find the fall time

Only the positive value has aphysical meaning: t = 2.26 seconds.

2. Speed when they hit the ground

i) The horizontal speed is constant:

ii) The vertical speed is:

iii) Total speed

a electromagnetic waves