Matching motion diagrams to acceleration descriptions

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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).