A rocket launched from earth with a rest mass of 160 000 kg moves at 2.9 x 10" m/s during a voyage that takes 1.2 years, according to a clock on board the rocket. a) Using relativity, calculate how long the voyage would take, from earth's reference frame.b) Find the length of the rocket in earth's frame of reference when it is moving, given that the rest length is 140 m. Assume you are a stationary observer viewing the rocket from the side.c) Find the relativistic mass of the rocket when it is moving