A plane whose airspeed is 220 km/h heads due north. It suddenly encounters a 150 km/h cross wind blowing due east. What is the resulting velocity of the plane with respect to the ground?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

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

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d