4. Ben Rushin is waiting at a stoplight in his 1500 kg car. When it finally turns green, Ben accelerated from rest at a rate of a 6.0 m/s2 for a time of 4.0 seconds.
a. What is the weight of Ben's Car?
b. How fast is Ben going after 4.0 seconds?
c. How much force is exerted by the car to accelerate of that rate?

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.