impulse momentum help

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
I used ∫Fdt = m(vf-vo)

and came up with -.822 m/s for the final velocity…

I have been reworking this problem over and over and cannot come up with a different answer…

Am i wrong in using the impulse momentum theorem?

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