英文相对论物理题.Intergalactic space travellers need to know the rel

英文相对论物理题.Intergalactic space travellers need to know the relative velocities and masses of theirspace ships.Each ship,therefore,has a 1.0 m long bar painted on the side of the shipalongside their rest mass.as you pass by a ship you measure this 1.0 m bar as 0.93m.What is your relative velocity?You also observe their ship measure for printed as365,000 kg.What is their mass relative to you?What does an observer in the othership measure for your 1.0 m bar?