Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 3 - Kinematics in Two Dimensions - Check Your Understanding - Page 66: 4


Yes, No

Work Step by Step

Since the only force acting on the projectile is in the downward direction and is due to gravity, the acceleration is always in the downward direction. Since the vertical component of the velocity is zero at the topmost point, the velocity becomes horizontal at that point. Since the velocity at that point is horizontal and the acceleration is vertical, they are perpendicular. The velocity and acceleration can never become parallel unless the angle $\theta$ is not equal to 90 degree
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