Answer
$v_A = 3.0 m/s$
Work Step by Step
We know that:
$v_f^2 = v_i^2 -2ad$
Thus, we obtain:
$(1/3v_A)^{2}=1/9v_A^2 = v_A^2 - 2*(-9.8m/s^2)(0.40m)$
Solving for $v_A$, we obtain: $v_A = 3.0 m/s$
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 2 - Motion Along a Straight Line - Problems - Page 36: 56
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