Suppose we have a two giant ideal springs very far apart from each other such that each spring can be used to launch a spaceship X to relativistic speeds. So a spaceship is launched using spring A to relativistic speeds, it reaches spring B which it compresses and is thus relaunched when spring B relaxes and the cycle thus continues. Now say there is a person inside spaceship X who shines a flashlight out of a window of the spaceship onto say a large number of solar panels lined up along the route from spring A to B. Whenever the spaceship accelerates (decelerates) he switches off the flashlight. Now from the perspective of the solar panels, since the spaceship X is traveling at relativistic speeds, say 1 minute of the shining of the flashlight relative to the spaceship corresponds to 10 years relative to the solar panels. How is a 1 minute burn of a flashlight able to generate enough energy to generate electricity for 10 years? Is it because the chemical bond strengths change at relativistic speeds?