What does the kinetic energy of a moving object depend on?

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?