Exam 2: Motion in One Dimension

Starting from rest, a car accelerates down a straight road with constant acceleration a for a time t, then the direction of the acceleration is reversed, i.e., it is -a, and the car comes to a stop in an additional time t, the time for the whole trip being 2t.At what time, or times, is the average velocity of the car for the trip equal to its instantaneous velocity during the trip?

In one-dimensional motion, the average speed of an object that moves from one place to another and then back to its original place has which of the following properties?

Starting from rest, a car accelerates down a straight road with constant acceleration a₁ for a time t₁, then the acceleration is changed to a different constant value a₂ for an additional time t₂.The total elapsed time is t₁ + t₂.Can the equations of kinematics be used to find the total distance traveled?