thank you for trying.
Yes it is 0.85c actual speed.
but the question is asking from
niels point of view what is the speed , legnth of the rocket. And
According to the alien, with what speed is the rocket apporaching?
according to the alien, the alien spaceship has a mass of 2550 kg .According to Neil, what is the kinetic energy of the spaceship?
Neil observed the above pursuit for 35 minutes. In that time, how much did the alien age by?
thank you for trying mate