(1) A particle move along the x axis, as (SI unit). (a) The functions of its velocity and accelerator vector against time； (10 marks ) (b) Its average velocity in the first 3 seconds. (10 marks )

Listed following are various physical situations that describe how light interacts with matter. match these to the appropriate category. 1) transmission? -visible light meets clear glass -visible light does not pass through a black wall -red light hits a red sweatshirt -light comes from your computer screen -cell phone signals pass through walls -blue light hits a red sweatshirt -white light hits a white piece of paper -light comes from a light bulb