Question

Jake drops a book out of a window from a height of 10 meters. At what velocity does the book hit the ground?

A.
7.0 meters/second
B.
10 meters/second
C.
14 meters/second
D.
28 meters/second
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Answer 1

kinematics equation

vf^2 = vi^2 + 2*a*d

where vi is the initial velocity (0, since it's dropped)
a is the acceleration due to gravity (9.81 m/s/s)
and d is the distance (10 meters)

plug in your a, d, vi, and solve for vf