A race car travels around a track. It took him 5 seconds to complete 1 lap and come back to the starting line. What was his average velocity?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Which accurately compares concave and convex lenses?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?