Answer
$dm/dt=4*t^{-0.2}-3=0$
$t=4.21s$
Work Step by Step
The derivation the the function gives the rate with respect to t.
$dm/dt=4*t^(-0.2)-3$
Set $dm/dt=0$ gives the extreme value, which is the maximum in this case.
Solve for t using $dm/dt=0$
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 1 - Measurement - Problems - Page 10: 30a
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