which point on the pendulums swing represents the minimum potential energy?\na a\nb b\nc c\nd a&c

Explanation:

Step1: Recall potential - energy formula

The gravitational potential energy formula is $U = mgh$, where $m$ is mass, $g$ is the acceleration due to gravity, and $h$ is the height above a reference level.

Step2: Analyze height at each point

At point B, the pendulum bob is at the lowest - point of its swing. So, the height $h$ of the bob above the reference level (lowest - point) is minimum at point B. Since $U = mgh$ and $m$ and $g$ are constant, when $h$ is minimum, the potential energy $U$ is minimum.

Answer:

B. B