4 1 pts Car in UCM | Problem A car is traveling at a constant speed v at the bottom of a circular hill of radius 9.00 meters. A passenger in the car is sitting on a scale. At the moment when the car is at the bottom of the hill, the value indicated on the scale is 80% greater than when the car is at rest on level ground. What is the car's speed? Use g = 9.80 m/s2. Group of answer choices We need to know the passenger's mass in order to find the car's speed. 8.40 m/s 9.39 m/s 12.6 m/s