An object is thrown horizontally from the open window of a building. if the initial speed of the object is 20 m/s and it hits the ground 2.0 s later, from what height was it thrown? (neglect air resistance and assume the ground is level.)

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.