Answer
$7\ m/s$
Work Step by Step
Initial velocity of the ball can be found from the kinematic equation as:
$v^2-u^2=2as$
$v^2-u^2=2gh$
$(3u)^2-u^2=2(9.8\ m/s^2)(20\ m)$
$8u^2=392$
$u^2=49$
$u=7\ m/s$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 4 - Motion in Two and Three Dimensions - Problems - Page 91: 104
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