An 8.0 kg ball travelling at 4m/s collides head on with a 3kg ball travelling at 14m/s . The balls bounce off each other and travel back the way they came. The 8.0 ball away at 2m/s . Calculate the velocity of the 3kg ball after the collision

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.