Position-time graph Velocity-time graph Q2. An ambulance is travelling at a constant velocity of 14 m/s [E]. After a short time, the ambulance driver receives a message to attend to an emergency. The ambulance quickly decelerates to a stop, turns around and accelerates to 22 m/s [W]. Position-time graph Velocity-time graph Q3. A dog plays fetch: the dog accelerates towards a ball, decelerates to a stop to retrieve the ball, then accelerates back towards its owner and decelerates to a stop as it reaches its owner. Velocity-time graph Position-time graph t -t -t t 1.p Practice Questions Sketch a graph for each of the following situations. Q1. A car waits at a red light for 12 seconds, then accelerates North at a constant rate up to a 16 m/s over 4 seconds. The car maintains that constant velocity for 15 seconds.