Can you check my answer to this F = ma problem?

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♥ Sprinkles

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A speedboat has a mass of 5.0 x 10^2 kg. It starts from rest and travels 2.0 x 10^2 m in 3.0 seconds. The boat undergoes uniform acceleration during the 3.0 seconds. What is the unbalanced force on the boat?

For the velocity, I got ~ 66 m/s.
I used that to find the acceleration and got 22 m/s^2 but I'm not sure if that's right.
After that, I used the equation F= ma to get a force of 11,000 kg x m/s^2, or 11,000 N.
 
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