10. (a) Neglecting gravitational forces, what force would be re- quired to accelerate a 1200-metric-ton spaceship from rest to one-tenth the speed of light in 3 days? In 2 months? (One metric ton = 1000 kg.) (b) Assuming that the engines are shut down when this speed is reached, what would be the time required to complete a 5-light-month journey for each of these two cases? (Use 1 month = 30 days.) %3D

10. (a) Neglecting gravitational forces, what force would be re- quired to accelerate a 1200-metric-ton spaceship from rest to one-tenth the speed of light in 3 days? In 2 months? (One metric ton = 1000 kg.) (b) Assuming that the engines are shut down when this speed is reached, what would be the time required to complete a 5-light-month journey for each of these two cases? (Use 1 month = 30 days.) %3D