Let the zero of the potential energy be at x = 0 m. What is the potential energy at x = 1.0, 2.0, 3.0, and 4.0 m? Hint: Think about the definition of potential energy and the geometric interpretation of the work done by a varying force.

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?