## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

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