A book is slid across a slick floor starting at velocity . t seconds later, its velocity is .

**a.**- In terms of , t, and g, find the average acceleration a, the coefficient of friction between the book and the floor , and how far the book travels during this interval t.
**b.**- Find a, and d given =5.0 meters per second, =1.0 meters per second, t=4.0 seconds.

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