If you're driving towards the sun late in the afternoon, you can reduce the glare from the road by wearing sunglasses that permit only the passage of light that's a. dispersed in a spherical plane. b. polarized in a vertical plane. c. dispersed in a vertical plane. d. polarized in a horizontal plane.

May someone explain how to do this question?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up