a box is moved from a low table to a high shelf. how is its mechanical energy affected?\nit remains the…

Brief Explanations:

Mechanical energy is the sum of kinetic and potential energy. When a box is moved from a low - table to a high - shelf, its height above the ground increases. Gravitational potential energy is given by $U = mgh$ (where $m$ is mass, $g$ is gravitational acceleration, and $h$ is height), so potential energy increases. Since the box is not accelerating or decelerating in terms of its horizontal motion (assuming no change in speed), kinetic energy $K=\frac{1}{2}mv^{2}$ remains the same. Thus, mechanical energy (sum of $K$ and $U$) increases.

Answer:

It increases, because its potential energy increases and its kinetic energy remains the same.