Two carts are connected by a 0.05 m spring. The cart hits a wall, compressing the spring to 0.02 m. The spring constant k is 100 N/m. What is the spring potential energy stored from the spring's compression?

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.