Question

where is the potential energy of the roller coaster the lowest? a a b b c c d d

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 height.

Step2: Analyze height at different points

Since $m$ and $g$ are constant for the roller - coaster, the potential energy depends on height $h$. The lower the height $h$, the lower the potential energy. Point D has the lowest height among points A, B, C, and D.

Answer:

D. D