Elevator Acceleration and Ball Gets Dropped

[physicshelplz]

Homework Statement

An elevator accelerates from the top floor at 100 m height downward with a uniform acceleration of a. After 5.0 s, an object is dropped out of an opening in the door, and that
object hits the ground 3 s later. Find a. How high up was the elevator when the object was dropped?

Homework Equations

The Attempt at a Solution

 

[Simon Bridge]

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