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: 47


6.12 s

Work Step by Step

Let up be the positive direction. The extra time taken by the pellet from gun A is the time taken for it to go up and come back down to the cliff edge. Its velocity when it comes back to the cliff edge is -30.0 m/s due to symmetry $v=u+at$ $t=\frac{v-u}{a}$ $t=\frac{(-30.0)-(30.0)}{(-9.8)}\approx6.12\; s$
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