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 121 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 = 20 Solution: a = v2 ? v1 t 1 2 at 2 a = 1.852 m s
2
km hr
v2 = 120
km hr
t = 15 s
d = v1 t +
d = 291.67 m
Problem 122 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 = 2a d
2
v = 80
ft s
2
d = 500 ft
v a = 2d t = v a
a = 6.4
ft s
2
v = at
t = 12.5 s
Problem 123 A baseball is thrown downward from a tower of height h with an initial speed v0. Determine the speed at which it hits the ground and the tim
