Answer
She makes it back in 3.33 minutes, which is enough time.
Work Step by Step
We know that momentum is conserved. Thus, we find:
$v = \frac{10\times8}{80}=1\ m/s$
Thus, it will take her:
$\frac{200}{1}=200 \ s = 3.33 \ min$
Essential University Physics: Volume 1 (4th Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0-134-98855-8
ISBN 13:
978-0-13498-855-9
Chapter 9 - Exercises and Problems - Page 173: 89
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