Answer
$t=4s$
Work Step by Step
We know the following equation:
$a=\frac{\Delta v}{t}$
We plug in the known values to obtain:
$t=\frac{\Delta v}{a}=\frac{(50m/s)-(30m/s)}{(5m/s^{2})}=4s$
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 2 - Motion Along a Straight Line - Problems - Page 37: 80b
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