Work Power energy problem

  • #1
Hi friend please help me in solving this issue.
Thank you all in advance.

The problem is as such:
[Broken]

Attempt to the problem:

[Broken]

[Broken]

But the book says answer of the question is option (A)
 
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Answers and Replies

  • #2
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You did almost everything correctly, but made a mistake solving the equations for acceleration.
 
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