9. You and your devious friends push a 1200 kg car along a level road, accelerating it from rest. The pushers transfer 6500 J of energy into the system and loses -2000. J in the Eth account due to friction.
How fast will the vehicle be traveling after the push?

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.