### Problems

### 3.1 Acceleration

The driver of a sports car traveling at 10.0 m/s steps down hard on the accelerator for 5.0 s and the velocity increases to 30.0 m/s. What was the average acceleration of the car during the 5.0 s time interval?

- â€“1.0 Ã— 102 m/s
^{2} - â€“4.0 m/s
^{2} - 4.0 m/s
^{2} - 1.0 Ã— 102 m/s
^{2}

A girl rolls a basketball across a basketball court. The ball slowly decelerates at a rate of âˆ’0.20 m/s^{2}. If the initial velocity was 2.0 m/s and the ball rolled to a stop at 5.0 sec after 12:00 p.m., at what time did she start the ball rolling?

- 0.1 seconds before noon
- 0.1 seconds after noon
- 5 seconds before noon
- 5 seconds after noon

### 3.2 Representing Acceleration with Equations and Graphs

A swan on a lake gets airborne by flapping its wings and running on top of the water. If the swan must reach a velocity of 6.00 m/s to take off and it accelerates from rest at an average rate of 0.350 m/s^{2}, how far will it travel before becoming airborne?

- âˆ’8.60 m
- 8.60 m
- âˆ’51.4 m
- 51.4 m

- $0.408\phantom{\rule{thinmathspace}{0ex}}\text{s}$
- $0.816\phantom{\rule{thinmathspace}{0ex}}\text{s}$
- $1.34\phantom{\rule{thinmathspace}{0ex}}\text{s}$
- $1.75\phantom{\rule{thinmathspace}{0ex}}\text{s}$
- 1.28 s