Agirl is a passenger aboard a moving train. the girl has a toy wind-up car that she lets travel down the aisle of the train. from experience, the girl knows that the wind-up car travels at 0.5 m/s. the relative velocity of the toy car is 0.5 m/s from the perspective of a) a passenger walking down the aisle in the same direction as the toy car b)a passenger walking down the aisle in the opposite direction as the toy car c)a seated passenger on the train d) a person outside the train, observing the train move by