8.18 Chapter 2. Second order differential equations. Section 2.11, Differential equations with discontinuous right-hand sides. Excercises page 243

8.18.1 problem 1
8.18.2 problem 2
8.18.3 problem 3
8.18.4 problem 4
8.18.5 problem 5
8.18.6 problem 6
8.18.7 problem 7
8.18.8 problem 8
8.18.9 problem 9