3. A piece of stone is thrown from the rooftop. Which statement is TRUE if the motion of the
stone is in flight?
A. The stone's horizontal and vertical motions are increasing on its way down.
B. The stone's horizontal motion increases while its vertical motion decreases on its way down.
C. The stone's horizontal motion is constant while its vertical motion increases on
its way down
.
D. The stone's horizontal motion is constant while its vertical motion decreases on its
way
down.

The stone's kinetic and potential energies change with height, the stone's acceleration at its highest point is due to gravity, and in two-dimensional motion, vertical velocity changes while horizontal velocity remains constant.

Explanation:

True or false If a rock is thrown into the air, the increase in the height would increase the rock's kinetic energy, and then the increase in the velocity as it falls to the ground would increase its potential energy.

When a stone is thrown vertically upward and returns to the ground, ignoring friction, its acceleration as it reaches the highest point of its motion is due to gravity.

In two-dimensional projectile motion, the stone's vertical motion involves changes in velocity while its horizontal motion remains constant, leading to a combination of vertical and horizontal velocities at different points of its trajectory.

Learn more about Projectile motion here:

https://brainly.com/question/29545516