Solve this high school physics problem please :]?

j-wings

New member
I've tried solving it with my friends; however, we do not get the same answer and don't know which answer is correct and whether if our ways of sove this problem is correct or not.

So I come here and ask all of you :]

http://www.uppicweb.com/show.php?id=bbf2644f2aaf67e2294e89fa3cbefc0d

This is the problem. I 'll translate detail into English.

The 1-kg mass is hang by spring, of which constant is k. The 2-kg mass is hang with the rope suspending the ceiling as shown in the picture. If the rope is instantly cut, what is the initial acceleration of the 2-kg mass?

Please tell me the answer and how to solve this problem.
Moreover, please tell me which chapters of physics should I study in order to solve this type of question more fluently.

Thank you in advance :]
 
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