Suppose your lab partner has a height L of 170 cm (5 ft, 7 in) and a weight w of 680 N (153 lb). You can determine the position of his center of gravity by having him stretch out on a uniform board supported at one end by a scale, as shown in the figure. If the board's weight wb is 49 N and the scale reading F is 3.81 102 N, find the distance of your lab partner's center of gravity from the left end of the board.