Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 2 - Kinematics in One Dimension - Problems - Page 50: 46


39.2 m/s up

Work Step by Step

Let up be the positive direction $x=ut+\frac{1}{2}at^{2}$ $u=\frac{x-\frac{1}{2}at^{2}}{t}$ $u=\frac{0-\frac{1}{2}(-9.8)(8.0)^{2}}{(8.0)}=39.2\; m/s$ Hence, the initial velocity is 39.2 m/s up.
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