prelab for Physics 1250 lab "2-D Kinematics" Which of the following statements about this lab is true? O The launcher clamps to the tabletop, so the initial position of the ball is the height of the tabletop as measured from the floor. 0 The launch speed depends on the launch angle. 0 To account for air drag, you will use an air drag factor to correct your measurement. 0 In order to determine the initial speed of the launcher, you will shoot the ball straight up and record the peak height. A boy tosses a coin straight up to 2.7 m. Suppose the height when the coin leaves his hand is 1.2 m. What was the initial speed of the coin when it left his hand? :J m/s Suppose during the lab you read 70 from the protractor. If the initial speed of the ball is 10.6 m/s the vertical component of the initial velocity of the ball is: :] m/s Which of the following statements is TRUE according to this experiment? O For the graded activity, you should test launch the ball before calling your instructor to observe. Q You will vary the initial speed yourself by adjusting a knob. O The initial position of the ball is measured when the spring is fully compressed. Q We assume the initial speed of the ball is the same at 0 and at 90