Question 4 (1 point) A person is riding their bike with an intial velocity of vO as shown in the diagram below. Refer to the coorindate system and choose which set of signs best describes the initial position, initial velocity and acceleration respectively if the person is slowing down. +X O a) Positive Positive Negative O b) Negative Positive Negative O c) Negative Negative Positive O d) Negative Negative Negative O e) Not enough information to decide. Question 5 (1 point) During a race a runner runs 18.0 km in a straight line in 60.0 min, which of the following statements below is necessarily true? O a) The runner must have covered first 9.0 km in 30.0 minutes. O b) The velocity of the runner is constant. O c) The speed of the runner must be 18.0 km/h throughout the entire run. O d) The average velocity of the runner is 18.0 km/h in the direction of motion. O e) The acceleration of the runner must be non-zero