Response:
The accurate statements are
Concerning an object in two-dimensional projectile motion devoid of air resistance:
D) The object's speed reaches zero at its peak elevation.
E) Horizontal acceleration remains zero while vertical acceleration is consistently a non-zero downward value
Clarification:
A) The object maintains constant speed, yet its velocity changes.
False; vertical velocity increases during descent.
B) The object's acceleration remains constant, but it is +g while ascending and -g while descending.
False; acceleration is -g when the object ascends.
C) At the peak altitude, the object's acceleration becomes zero.
False; acceleration maintains a consistent magnitude throughout the trajectory.
D) The speed of the object is zero at its peak elevation.
True; at the highest point, the direction alters, causing the object to momentarily cease motion, resulting in zero speed.
E) The horizontal acceleration is always at zero, while the vertical acceleration is a non-zero constant directed downward.
True; horizontal acceleration does not maintain any force during motion. In contrast, vertical acceleration results from gravity and remains constant in the downward direction.
