### Extended Response

### 3.1 Acceleration

- The direction of the initial acceleration vector will point towards the wall, and its magnitude will be less than the acceleration vector of the crash.
- The direction of the initial acceleration vector will point away from the wall, and its magnitude will be less than the vector of the crash.
- The direction of the initial acceleration vector will point towards the wall, and its magnitude will be more than the acceleration vector of the crash.
- The direction of the initial acceleration vector will point away from the wall, and its magnitude will be more than the acceleration vector of the crash.

A car accelerates from rest at a stop sign at a rate of 3.0 m/s^{2} to a speed of 21.0 m/s, and then immediately begins to decelerate to a stop at the next stop sign at a rate of 4.0 m/s^{2}. How long did it take the car to travel from the first stop sign to the second stop sign? Show your work.

- 1.7 seconds
- 5.3 seconds
- 7.0 seconds
- 12 seconds

### 3.2 Representing Acceleration with Equations and Graphs

True or False: Consider an object moving with constant acceleration. The plot of displacement versus time for such motion is a curved line while the plot of displacement versus time squared is a straight line.

- True
- False

- 0.574 s
- 0.956 s
- 1.53 s
- 1.91 s