Write down the formulas, including the one for the rotational inertia of the washer (which toy need to find), leading to the final formula for the mass of the washer (X: m1). Plug in the values of the angular speeds you obtained for each of the 5 trials (1B through 5B), and obtain 5 values of X: m1. Take the average of these as your final experimental value. I will publish the standard value of X: m1 after the lab reports are submitted. Your result should be within 10% of the published result for maximum credit.