一球从100m高度自由落下，每次落地后反弹回原高度的一半，在落下，求他再第十次落地时，共经过多少米？第十次反弹多高？-A ball from a height of 100m free fall, bounced back after each fall to half the original height, in the fall, seeking him to the tenth floor, the total, how many meters? How high the tenth b