I need answers for this wave unit

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

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

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j