calculus in mechanics

just now i tried to answer 1 mechanics question from the blue mechanics book.

i'd tried for this whole day until tonight.

i can answer other questions but not this one.

it's not complex actually.but i don't know why it's too hard to get the answer.

credit:http://pathstoknowledge.files.wordpress.com/

The question is from exercise 16B no 3.

arghh....help me please.anyone?..

eh,physics is waiting~~

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