Answer
$v_f= 11.29m/s $
Work Step by Step
$h_i = 0m$
$v_i = 7m/s$
$h_2=h_f = -2m$
*downwards is positive*
eqn from part (a):
$v_f=\sqrt {2g(h_i -h_f) + v_i^2 )} $
$v_f=\sqrt {2\times 9.8(0 -(-2)) + 7^2 )} $
$v_f= 11.29m/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 8 - Potential Energy and Conservation of Energy - Problems - Page 210: 86b
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