Kinematic Problems Using Velocity vs Time Graphs

At t = 0 s a car has a speed of 30 m/s. After 6 s, its speed is 15 m/s. 1.) Graph the situation. 2.) What is the average acceleration of the car? 3.) How far does it travel in this time? Two solutions are provided for the third part of this problem: a kinematic equation and determining the area under the curve on a v-t graph.