Answer:
Below
Step-by-step explanation:
Find the velocity if it was just DROPPED from 10m
d = 1/2 at^2
10 = 1/2 * 9.81 * t^2 shows t = 1.42784 s to hit ground from 10 m
velocity if just dropped v = at = 9.81 * 1.4278414 m/s
when the book is tossed up...and it returns to the launch point it will have the same magnitude of velocity
so it was launched up at the difference between what it was if just dropped and the final v of 17.5
17.5 - 14 = 3.5 m/s initial v