. t seconds later, its velocity is 
.
A book is slid across a slick floor starting at velocity . t seconds later, its velocity is .
, 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.
and d given =5.0 meters per second, =1.0 meters per second, t=4.0 seconds.
