Update of an old problem, the OP didnt put it down fully

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AI Thread Summary
The discussion revolves around a physics problem involving a block subjected to forces and spring mechanics. The original poster (OP) has successfully solved parts (a), (b), and (c) but is struggling with parts (d) and (e), which require finding the block's position at maximum kinetic energy and the value of that kinetic energy. The OP mentions using the relationship between changes in kinetic energy and work done by the applied and spring forces to approach the problem. Despite previous attempts to seek help, the OP expresses frustration over the lack of responses and urgency due to an impending deadline. The thread highlights the need for clarity in problem-solving steps and community support in academic challenges.
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Homework Statement



https://www.physicsforums.com/showthread.php?t=77424

It's that exact problem, except I need the latter parts to it.

(a) What is the position of the block?
m
(b) What is the work that has been done on the block by the applied force?
J
(c) What is the work that has been done on the block by the spring force?
J
During the block's displacement, find the following values.
(d) The block's position when its kinetic energy is maximum.
m
(e) The value of that maximum kinetic energy.
mJ

The Attempt at a Solution



I solved A by myself from Fx = 1/2kx^2. Solved for x.

Then for C, I did -1/2kx^2. And B = 1/2kx^2.

I need parts D and E. How would I go about solving them? I know that deltaK = Kf - Ki = W(applied force) + W(spring).
 
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OK, am I doing something? I never get any replies on any of my threads...can someone PLEASE help? I would really appreciate it.

Thanks.
 
Come on guys please...this problem is due in about 1 hour on Webassign. ANY help would be appreciated. I was referred to this problem because supposedly it was the best but I'm not really seeing much help...=/
 

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