Object dropped on trampoline - Acceleration

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Homework Statement

For example, if given a question that has an object dropped onto a trampoline, the object will expand the trampoline when it hits it, would the acceleration be negative after the trampoline expands for example 1 meter?

Homework Equations

The Attempt at a Solution

 

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What are your thoughts on this problem?

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Well, I think that if the trampoline expands, the acceleration should be negative because your direction is negative.