Answer
It is not true.
Work Step by Step
If the speed is changing, there is a nonzero tangential acceleration. This component means that the overall acceleration is not perpendicular to the velocity. See Figure 3.30.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 3 - Motion in Two or Three Dimensions - Problems - Discussion Questions - Page 92: Q3.12
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