Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 2 - One-Dimensional Kinematics - Problems and Conceptual Exercises - Page 54: 84

Answer

(a) $58~m/s$ (b) $5.9~s$

Work Step by Step

(a) We know that $v_i=\sqrt{2gh}$ We plug in the known values to obtain: $v_i=\sqrt{2(9.81m/s^2)(170.7m)}$ $v_i=58m/s$ (b) We know that $t=\frac{2h}{v_i+v_f}$ We plug in the known values to obtain: $t=\frac{2(170.7m)}{58m/s+0m/s}$ $t=5.9s$
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