Which of the following is an example of a vector quantity? - temperature
- mass
- volume
- velocity

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° 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.)

Why do astronauts in the space shuttle weigh less?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.