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In Friday we did simple lab in Physics. We took ball and dropped it measuring dropping height and rebound height. We did 10 trials and 10 times for every trial. We started from 100 cm and went all the way to 10 cm. Then we made a model y =0.75x+2 cm. Where x is dropping height in cm and y is rebound height, also, in cm. We could use this model to predict rebound height from any height. Well the accuracy wasn't really the priority. My question is if I "drop" the ball from height of zero cm I would get reboung height 2 cm, according to my model. How can that be?