Which is true of the planned Breakthrough Starshot mission? I. It requires a laser-propelled lightsail to travel through the interstellar medium II. It uses solar sail technology. III. The trajectory is not significantly affect by Lorentz-force effects and relativity. IV. It is achieved by launching a spacecraft-as-bullet from a railgun. e. (3 points) Which of the following is not possible from a prograde flyby maneuver of Jupiter? I. Increase the energy of the heliocentric orbit that precedes and follows the flyby. II. Change the inclination of the heliocentric orbit that precedes and follows the flyby. III. Recover spent propellant to refuel the spacecraft. IV. Enter an orbit around Jupiter without using propellant. f. (3 points) Which is an assumption of the restricted two-body problem? I. The barycenter of the two bodies is at the center of the larger body. II. Any number of gravitational sources may be present, as long as they are modeled as point masses. III. All orbital paths are restricted to equatorial circles, ellipses, parabolas, or hyperbolas. IV. Both bodies are roughly equal in mass