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

The position of an object as a function of time is given by = bt^3 ihat + ct jhat . If and , what is the force on a 2.0 kg object when t = 1.8 s?

**3. The attempt at a solution**

I tried multiplying it and got m ihat + m jhat. I don't even know where to begin.