In a lab, students dropped a tennis ball in order to calculate the mechanical energy lost by the falling ball. data: mass=0.057kg, height=2.280m, time=0.668s, PE=1.23J, and KE=1.22J 1) Calculate the mechanical energy lost by finding the difference between PE and KE (show work with units) 2) Was there a measurable amount of mechanical energy lost in the experiment? 3) Why, in a physical situation such as this lab experiment, doesn't the entire PE get converted into KE? 4a) Is this an ideal or non-ideal system? b) How do you know