## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson

# Chapter 4 - Kinematics in Two Dimensions - Conceptual Questions - Page 104: 5

#### Answer

(a) $v_x, a_x,$ and $a_y$ are constant during the flight. (b) $a_x = 0$ throughout the flight.

#### Work Step by Step

(a) $v_x, a_x,$ and $a_y$ are constant during the flight. The $x$ and $y$ positions change during the flight, so they are not constant. Because of gravity, $v_y$ decreases throughout the flight so it is not constant. $v_x$ is constant throughout the flight as there is no horizontal acceleration. $a_x$ is constant and equal to zero because there is no horizontal force during the flight (when we ignore air resistance). $a_y$ is constant (equal to $g$) throughout the flight and it is directed toward the ground. (b) $a_x = 0$ throughout the flight because there is no horizontal force acting on the object during the flight (assuming we ignore air resistance).

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