Acceleration Problem: Need Help Solving!

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The discussion revolves around a problem related to acceleration, specifically focusing on correctly assigning letters to pictures in a given problem set. The user confirms that their answers for pictures 1 and 2 are correct, but they are struggling with pictures 3, 4, and 5. They request assistance in resolving these inaccuracies. The user also provides a conceptual hint, suggesting that the sponge should be considered as a spring supported by a solid, immovable material. Help is sought to clarify the correct assignments for the remaining images.
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Hello I have a link to the problem #2. The directions are shown by letter and I had to assign the letters to the pictures below. I am wrong.. can someone help me please?

http://i.imgur.com/lqEZFfl.jpg
 
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1 and 2 is correct, but not 3,4 and 5.
Think of the sponge as a spring (backed by a solid material that does not move or give).
 

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