Answer
Please see the work below.
Work Step by Step
We know that
$t=\sqrt{\frac{2h}{g}}$
$t=\sqrt{\frac{2(0.196)}{9.8}}=0.2s$
As there are four drops at 0.2 seconds, the number of drops per second can be determined as
$N=\frac{4}{0.2}=20 drops$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 2 - Exercises and Problems - Page 31: 84
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