Fire the launcher several times to obtain an average landing position. Collect the data you need based on your list in question 4. Be sure to collect several "runs" of data. Make a table below of all your measurements. 7. You will have to think about averages when calculating the velocity, not every "run" will be exactly the same. Why? How does this variability influence your confidence in your result? How will you take this variability into account? 8. Determine the horizontal velocity v x (0) with which the projectile left the launcher. Calculate the average and standard deviation. (In Part 2 we will assume that the cannon always fires the projectile with an initial velocity equal to this average value.)