A trailer attached to a truck is being pulled down a straight road without speeding up or slowing down. Which of the following graphs could possibly represent the net force on the trailer and the velocity of the trailer over time? O Force (N) 1.0 0.5 1 2 3 Time (s) 4 5 6 7 -0.5 -1.0 Velocity (m/s) 2 3 Time (s) 4 5 6 7 -15 -20 -25 ? -30 Velocity (m/s) 35 30 25 20 15 10 5 1 2 3 4 5 6 Time (s) 7 O Force (N) 300 250