Answer
$v_1=-67 cm/s$
Work Step by Step
We know that the sum of the momentums must be 0 due to conservation of momentum:
$0= m_1v_1+m_2v_2$
$v_1=- \frac{m_2v_2}{m_1}$
$v_1=- \frac{(91 \ mg)(47 cm/s)}{64 mg}$
$v_1=-67 cm/s$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 9 - Exercises and Problems - Page 163: 19
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