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Table of Contents
Chapter 12 Chapter 13 Chapter 14 Chapter 15 Chapter 16 Chapter 17 Chapter 18 Chapter 19 Chapter 20 Chapter 21 Chapter 22 1 145 242 302 396 504 591 632 666 714 786

Engineering Mechanics - Dynamics

Chapter 12

Problem 12-1 A truck traveling along a straight road at speed v1, increases its speed to v2 in time t. If its acceleration is constant, determine the distance traveled. Given: v1 ¡ë 20 Solution: a ¡ë v2 ? v1 t 1 2 at 2 a ¡ë 1.852 m s
2

km hr

v2 ¡ë 120

km hr

t ¡ë 15 s

d ¡ë v1 t +

d ¡ë 291.67 m

Problem 12-2 A car starts from rest and reaches a speed v after traveling a distance d along a straight road. Determine its constant acceleration and the time of travel. Given: Solution: v ¡ë 2a d
2

v ¡ë 80

ft s
2

d ¡ë 500 ft

v a ¡ë 2d t ¡ë v a

a ¡ë 6.4

ft s
2

v ¡ë at

t ¡ë 12.5 s

Problem 12-3 A baseball is thrown downward from a tower of height h with an initial speed v0. Determine the speed at which it hits the gro¡¦(»ý·«)