Suppose you are in a rocket with no windows, traveling in deep space far from other objects. Without looking outside the rocket or making any contact with the outside world, explain how you could determine whether the rocket is (a) moving forward at a constant 80% of the speed of light and (b) accelerating in the forward direction.

Solution 41DQ (a) Two inertial frame of reference are equivalent, and according to the concept of special theory of relativity, it is not possible to distinguish between two inertial frame of reference. Also all the motions with constant velocities are actually relative. That is the motion should be calculated with respect to some frame of reference. So in this case, since I am not able to observe outside world, it is not possible, in any means, to determine I am moving at 80%...