Solution Manual for Physics, 5th Edition by James
S. Walker | 2026 Update | with Complete
Solutions
Document Information
Textbook: Physics, 5th Edition
Author: James S. Walker
ISBN: 9780321976444
Academic Year: 2026
Total Questions: 300
Format: Multiple Choice with Correct Answers and Detailed Rationales
About this Solution Manual
This comprehensive solutions manual provides fully worked-out solutions to end-of-
chapter problems from Walker's Physics, 5th Edition. The textbook covers a broad range
of physics topics including kinematics, Newton's laws, energy, momentum, rotational
motion, fluids, thermodynamics, waves, electricity, magnetism, and optics. The official
Instructor's Solution Manual spans 1,219 pages and contains complete solutions to all
3,148 homework problems in the textbook.
,SECTION 1: INTRODUCTION TO PHYSICS & KINEMATICS
(Questions 1-40)
Question 1
A car travels 240 km in 3.0 hours. What is its average speed in m/s?
A) 22.2 m/s
B) 24.6 m/s
C) 25.5 m/s
D) 20.8 m/s
Correct Answer: A) 22.2 m/s
Rationale: Average speed is calculated as total distance divided by total time. Convert km
to m: 240 km = 240,000 m. Convert hours to seconds: 3.0 h = 3.0 × 3600 = 10,800 s. v =
240,,800 = 22.2 m/s.
Question 2
A ball is thrown upward with an initial velocity of 15 m/s. What is its displacement after
2.0 seconds? (Assume g = 9.8 m/s²)
A) 10.4 m upward
B) 15.0 m upward
C) 19.6 m upward
D) 25.0 m upward
Correct Answer: A) 10.4 m upward
,Rationale: Using the kinematic equation Δy = v₀t + ½at². With v₀ = 15 m/s upward, a = -
9.8 m/s², and t = 2.0 s: Δy = (15)(2.0) + ½(-9.8)(2.0)² = 30 - 19.6 = 10.4 m upward. The
ball is still rising at t = 2.0 s.
Question 3
A car accelerates from rest at 3.0 m/s² for 5.0 seconds. What distance does it travel?
A) 25.5 m
B) 30.0 m
C) 37.5 m
D) 45.0 m
Correct Answer: C) 37.5 m
Rationale: Using the kinematic equation Δx = v₀t + ½at². With v₀ = 0, a = 3.0 m/s², and t
= 5.0 s: Δx = 0 + ½(3.0)(5.0)² = 1.5 × 25 = 37.5 m.
Question 4
A train slows from 25 m/s to 10 m/s over a distance of 200 m. What is the acceleration?
A) -1.31 m/s²
B) -1.56 m/s²
C) -2.00 m/s²
D) -1.00 m/s²
Correct Answer: A) -1.31 m/s²
Rationale: Using the kinematic equation v² = v₀² + 2aΔx. Rearranging: a = (v² - v₀²)/(2Δx)
= (100 - 625)/(400) = -525/400 = -1.31 m/s². The negative sign indicates deceleration.
, Question 5
A projectile is fired horizontally from a height of 45 m with a speed of 20 m/s. How far
from the base of the cliff does it land? (g = 9.8 m/s²)
A) 45.6 m
B) 55.0 m
C) 60.0 m
D) 40.8 m
Correct Answer: C) 60.0 m
Rationale: Time to fall: h = ½gt² → 45 = ½(9.8)t² → t² = 45/4.9 = 9.18 → t = 3.03 s.
Horizontal distance: x = v₀t = 20 × 3.03 = 60.6 m ≈ 60.0 m. The vertical and horizontal
motions are independent of each other.
Question 6
When the brakes of a car apply suddenly, the body of a person moves toward the front
of the car due to which concept?
A) Newton's third law
B) Conservation of momentum
C) Inertia of motion
D) Friction
Correct Answer: C) Inertia of motion
Rationale: According to Newton's first law (law of inertia), an object remains in its state of
motion unless acted upon by an external force. When the car brakes suddenly, the person's
body continues to move forward due to its inertia, resisting the change in motion.
S. Walker | 2026 Update | with Complete
Solutions
Document Information
Textbook: Physics, 5th Edition
Author: James S. Walker
ISBN: 9780321976444
Academic Year: 2026
Total Questions: 300
Format: Multiple Choice with Correct Answers and Detailed Rationales
About this Solution Manual
This comprehensive solutions manual provides fully worked-out solutions to end-of-
chapter problems from Walker's Physics, 5th Edition. The textbook covers a broad range
of physics topics including kinematics, Newton's laws, energy, momentum, rotational
motion, fluids, thermodynamics, waves, electricity, magnetism, and optics. The official
Instructor's Solution Manual spans 1,219 pages and contains complete solutions to all
3,148 homework problems in the textbook.
,SECTION 1: INTRODUCTION TO PHYSICS & KINEMATICS
(Questions 1-40)
Question 1
A car travels 240 km in 3.0 hours. What is its average speed in m/s?
A) 22.2 m/s
B) 24.6 m/s
C) 25.5 m/s
D) 20.8 m/s
Correct Answer: A) 22.2 m/s
Rationale: Average speed is calculated as total distance divided by total time. Convert km
to m: 240 km = 240,000 m. Convert hours to seconds: 3.0 h = 3.0 × 3600 = 10,800 s. v =
240,,800 = 22.2 m/s.
Question 2
A ball is thrown upward with an initial velocity of 15 m/s. What is its displacement after
2.0 seconds? (Assume g = 9.8 m/s²)
A) 10.4 m upward
B) 15.0 m upward
C) 19.6 m upward
D) 25.0 m upward
Correct Answer: A) 10.4 m upward
,Rationale: Using the kinematic equation Δy = v₀t + ½at². With v₀ = 15 m/s upward, a = -
9.8 m/s², and t = 2.0 s: Δy = (15)(2.0) + ½(-9.8)(2.0)² = 30 - 19.6 = 10.4 m upward. The
ball is still rising at t = 2.0 s.
Question 3
A car accelerates from rest at 3.0 m/s² for 5.0 seconds. What distance does it travel?
A) 25.5 m
B) 30.0 m
C) 37.5 m
D) 45.0 m
Correct Answer: C) 37.5 m
Rationale: Using the kinematic equation Δx = v₀t + ½at². With v₀ = 0, a = 3.0 m/s², and t
= 5.0 s: Δx = 0 + ½(3.0)(5.0)² = 1.5 × 25 = 37.5 m.
Question 4
A train slows from 25 m/s to 10 m/s over a distance of 200 m. What is the acceleration?
A) -1.31 m/s²
B) -1.56 m/s²
C) -2.00 m/s²
D) -1.00 m/s²
Correct Answer: A) -1.31 m/s²
Rationale: Using the kinematic equation v² = v₀² + 2aΔx. Rearranging: a = (v² - v₀²)/(2Δx)
= (100 - 625)/(400) = -525/400 = -1.31 m/s². The negative sign indicates deceleration.
, Question 5
A projectile is fired horizontally from a height of 45 m with a speed of 20 m/s. How far
from the base of the cliff does it land? (g = 9.8 m/s²)
A) 45.6 m
B) 55.0 m
C) 60.0 m
D) 40.8 m
Correct Answer: C) 60.0 m
Rationale: Time to fall: h = ½gt² → 45 = ½(9.8)t² → t² = 45/4.9 = 9.18 → t = 3.03 s.
Horizontal distance: x = v₀t = 20 × 3.03 = 60.6 m ≈ 60.0 m. The vertical and horizontal
motions are independent of each other.
Question 6
When the brakes of a car apply suddenly, the body of a person moves toward the front
of the car due to which concept?
A) Newton's third law
B) Conservation of momentum
C) Inertia of motion
D) Friction
Correct Answer: C) Inertia of motion
Rationale: According to Newton's first law (law of inertia), an object remains in its state of
motion unless acted upon by an external force. When the car brakes suddenly, the person's
body continues to move forward due to its inertia, resisting the change in motion.
