Gerard is riding his bicycle directly east. His maximum instantaneous velocity was 8 meters per second and his minimum instantaneous velocity was 0 meters per second. He covered 7.20 kilometers in 20.0 minutes. What is his average velocity for the ride? 8 m/s
6 m/s
4 m/s
0 m/s

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.