Jump off the plane!

You jump off the plane and free fall for 180 meters, having the time of your life.

At that time you open your parachute and henceforth decelerate at 2 m/s^2 till you touch the ground at velocity of 4 m/s.

At what height (in meters) did you jump off the plane ?

Assume acceleration due to gravity g = 10 m/s^2

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