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**1. A 2 kg book is at rest on a flat frictionless surface at initial position xi=0. A force F= (2.5-x**

^{2}) is applied on the book. What is the Kinetic Energy of the block as it passes through x=2 m ?**2. W= Int ( force ) ; K= (1/2)mv**; W = K

^{2}_{1}- K

_{2}

**3. So I started out with finding the W by taking the integral of F from x=0 to x=2. Then i put the value of the work in the work-kinetic energy equation. And im stuck here cause i don't know where to use the mass of the book.**