Frame S' moves relative to frame S at 0.62c in the direction of increasing x. In frame S' a particle is measured to have a velocity of 0.47c in the direction of increasing x'.
(a) What is the velocity of the particle with respect to frame S? cDirection
(b) What would be the velocity of the particle with respect to S if the particle moved (at 0.47c) in the direction of decreasing x' in the S' frame? cDirection