How much more kinetic energy does your car have when it changes from 10 mph to 50 mph

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl,max are applied?