An unstable high-energy particle is created in the laboratory, and it moves at a speed of 0.992c. relative to a stationary reference frame fixed to the laboratory, the particle travels a distance of 2.56 × 10-3 m before disintegrating. what is (a) the proper distance and (b) the distance measured by a hypothetical person traveling with the particle? determine the particle's (c) proper lifetime and (d) its dilated lifetime