Answer
a) $\sqrt{2gl}$
b) $\sqrt{1.2gl}$
Work Step by Step
a) $E_{Pi}+E_{Ki}=E_{Pf}+E_{Kf}$
$mgl=\frac{mv^2}{2}$
$v=\sqrt{2gl}$
b) $mgl=\frac{mv^2}{2}+mg(0.4l)$
$v=\sqrt{1.2gl}$
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 6 - Work and Energy - General Problems - Page 168: 90
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