The following diagram shows the path taken by the center of mass of a baseball player sliding along the ground in an attempt to make the base. The player is moving at a speed of 10m/s just before the slide and his speed 0.5 seconds later is 8.0m/s. The mass of the player is 80kg 1a) Calculate the magnitude of his change in velocity during this 0.5second interval. b) Calculate the average acceleration during the 0.5 second interval. My answer: cos20 = a/8 a = 7.52 10 - a = 2.48 Therefore the change in velocity is 2.48m/s The actual answer: 3.7m/s How do you do this kind of question?