In which situation is the acceleration of the car negative? a) the velocity of a car was 75 km/h over 4 hours. b) the velocity of a car reduced from 50 km/h to 35 km/h over one minute. c) the velocity of a car increased from 40 km/h to 75 km/h over 15 minutes. eliminate d) the velocity of a car was 45 km/h at 2: 00 pm and at 4: 00 pm the velocity of the car was 85 km/h.