Physics

# Problems

PhysicsProblems

## 3.1Acceleration

12.

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?

1. –1.0 × 102 m/s2
2. –4.0 m/s2
3. 4.0 m/s2
4. 1.0 × 102 m/s2
13.

A girl rolls a basketball across a basketball court. The ball slowly decelerates at a rate of −0.20 m/s2. 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?

1. 0.1 seconds before noon
2. 0.1 seconds after noon
3. 5 seconds before noon
4. 5 seconds after noon

## 3.2Representing Acceleration with Equations and Graphs

14.

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 a constant rate of 0.350 m/s2, how far will it travel before becoming airborne?

1. −8.60 m
2. 8.60 m
3. −51.4 m
4. 51.4 m
15 .
A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of $4.00\,\text{m/s}$ and her takeoff point is $8\,\text{m}$ above the pool. How long are her feet in the air?
1. $0.408\,\text{s}$
2. $0.816\,\text{s}$
3. $1.34\,\text{s}$
4. $1.75\,\text{s}$
5. 1.28 s
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