Jump off the plane!

Classical Mechanics Level 2

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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