A bird flies 200 km in 4.5 hours. What is the birds average speed? 900 km/hr
0.0225 km/hr
44.44 km/hr
245 km/hr

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.

Which inventor was often called the lady edison

2) why do satelites not fall while revolving around the earth?