Motion & Forces: Find Block Speed After 3.9s

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Ahhh...I am getting the wrong answer...
okay I used Vf = Vo + at
Vf = 0 + (2.169 m/s^2)(3.98s) = 8.63 m/s
 
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Sorry nevermind I don't know why I used 3.98! I have been doing this stuff all day and there are so many numbers in my head I am getting confused lol!
 

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