The experiment you did in lab is repeated, using a uniform metal bar that is 80.0 cm long instead of the meterstick. since the bar is uniform, its center of gravity is at its center. the new experiment uses different hooks for hanging the masses from the bar, with mhook = 5.0 g. as in the experiment you did in lab, x1 = 5.00 cm, m1 = 300.0 g, and xp = 25.0 cm. in the new experiment, you make the same measurements as in your lab and plot x versus 1 m2 + mhook . the line that is the best fit to your data has slope 2800 cm · g. what is the mass of the bar?