A hiker walks the first half of a straight 1.4 km trail at a steady pace of 1.7 m/s, east. He walks the second half at a constant stride of 0.37 m/s, east. What is his average velocity along the entire 1.4 km trail?

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match