Problem 5: (5 points) A car has a tire (shown on the right) with outside diameter D=60cm. If the car is moving forward and you are using a video camera to record with 30-fps (frame per second). What is the maximum speed (km/h) that the car can move so that you won't feel its tire rotating reversely? (hint: consider the relation between the frequency of the spoke when rotating and the necessary sampling frequency) 30 8