Answer
$8tj + k $
Work Step by Step
The position is given by r = $ i + 4t^2j + tk $
The velocity is the derivative of the position so we need to take
$\frac{d}{dt} (i + 4t^2j + tk) $
This gives $0i + 8tj + 1k = 8tj + k $
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 4 - Motion in Two and Three Dimensions - Problems - Page 84: 13a
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